{"product_id":"obdmonster-v100-automotive-circuit-tester","title":"OBDMonster V100 Circuit Tester | 0–80V DC Automotive Power Probe","description":"\u003csection class=\"obdm-v100-product\"\u003e\n  \u003cstyle\u003e\n    .obdm-v100-product {\n      max-width: 1180px;\n      margin: 0 auto;\n      padding: 36px 18px;\n      font-family: Arial, Helvetica, sans-serif;\n      color: #1f1f1f;\n      line-height: 1.7;\n      background: #ffffff;\n    }\n\n    .obdm-v100-product * {\n      box-sizing: border-box;\n    }\n\n    .obdm-v100-product img {\n      width: 100%;\n      height: auto;\n      display: block;\n      border-radius: 16px;\n      margin: 28px 0 34px;\n      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);\n    }\n\n    .obdm-v100-hero {\n      background: linear-gradient(135deg, #050505 0%, #151515 58%, #300000 100%);\n      color: #ffffff;\n      padding: 42px 34px;\n      border-radius: 18px;\n      margin-bottom: 34px;\n      position: relative;\n      overflow: hidden;\n    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\u003cp\u003e\n      A multifunction 0–80V DC power circuit probe tester designed for automotive voltage testing, polarity checking,\n      continuity testing, component activation, grounding test, short circuit tracing, trailer lighting inspection,\n      and fast vehicle electrical troubleshooting.\n    \u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cp class=\"obdm-v100-intro\"\u003e\n    The \u003cstrong\u003eOBDMonster V100 Circuit Tester\u003c\/strong\u003e is a practical automotive electrical diagnostic tool built for\n    technicians, mobile mechanics, DIY users, trailer owners, motorcycle users, and repair shops. It helps users quickly\n    test vehicle circuits, identify power and ground, check continuity, activate components, verify grounding quality,\n    and locate electrical faults more efficiently.\n  \u003c\/p\u003e\n\n  \u003cp\u003e\n    Automotive electrical problems can be time-consuming when you only rely on guesswork. A blown fuse, dead light,\n    weak ground, bad relay, damaged wire, short circuit, or failed component can stop a system from working properly.\n    The V100 helps simplify the diagnostic process by giving clear voltage, polarity, and circuit feedback directly\n    at the test point.\n  \u003c\/p\u003e\n\n  \u003cdiv class=\"obdm-v100-highlight\"\u003e\n    \u003cp\u003e\n      \u003cstrong\u003eCore Advantage:\u003c\/strong\u003e The V100 supports \u003cstrong\u003e0–80V DC voltage testing\u003c\/strong\u003e, positive and negative\n      polarity output through the probe, continuity testing, component activation, grounding test, short circuit location,\n      trailer lighting connection test, spark plug checking, overload protection, and a long 5M test lead for whole-vehicle inspection.\n    \u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cimg src=\"https:\/\/m.media-amazon.com\/images\/S\/aplus-media-library-service-media\/7213229a-c885-458e-9f0d-53739c044239.__CR0,0,1464,600_PT0_SX1464_V1___.jpg\" alt=\"OBDMonster V100 multifunction 0 to 80V DC automotive circuit tester for voltage continuity polarity component activation short circuit grounding trailer lighting and spark plug testing\"\u003e\n\n  \u003ch2\u003eMultifunction 0–80V DC Circuit Tester for Cars, Trucks, Trailers, and More\u003c\/h2\u003e\n\n  \u003cp\u003e\n    The OBDMonster V100 is designed for a wide range of vehicle electrical systems from \u003cstrong\u003e0V to 80V DC\u003c\/strong\u003e.\n    This makes it useful for many automotive, motorcycle, trailer, boat, RV, and equipment electrical applications.\n    It can be used to test battery voltage, polarity, circuit continuity, grounding quality, component condition,\n    and wiring faults.\n  \u003c\/p\u003e\n\n  \u003cdiv class=\"obdm-v100-grid\"\u003e\n    \u003cdiv class=\"obdm-v100-card\"\u003e\n      \u003ch3\u003e0–80V DC Measurement\u003c\/h3\u003e\n      \u003cp\u003e\n        Test a wide range of DC automotive electrical circuits, including low-voltage and common vehicle power systems.\n      \u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"obdm-v100-card\"\u003e\n      \u003ch3\u003ePolarity Identification\u003c\/h3\u003e\n      \u003cp\u003e\n        Quickly identify positive and negative circuits using clear red and green LED feedback.\n      \u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"obdm-v100-card\"\u003e\n      \u003ch3\u003eComponent Activation\u003c\/h3\u003e\n      \u003cp\u003e\n        Apply positive or negative output through the probe to test supported electrical components.\n      \u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eBattery DC Voltage and Polarity Testing\u003c\/h2\u003e\n\n  \u003cp\u003e\n    The V100 can test automotive DC voltage and circuit polarity by connecting the tool to the battery using the\n    battery clips. The clear digital display and LED indicators help users quickly identify voltage, positive circuits,\n    negative circuits, and ground conditions.\n  \u003c\/p\u003e\n\n  \u003cp\u003e\n    When testing wiring, plugs, fuse boxes, relays, switches, or connectors, polarity identification is one of the\n    fastest ways to understand whether the circuit has power, ground, or an open condition. This helps reduce\n    unnecessary disassembly and speeds up electrical diagnosis.\n  \u003c\/p\u003e\n\n  \u003cimg src=\"https:\/\/m.media-amazon.com\/images\/S\/aplus-media-library-service-media\/4687718a-24b5-49b9-ab77-7117eae32cae.__CR0,0,1464,600_PT0_SX1464_V1___.jpg\" alt=\"OBDMonster V100 testing automotive voltage and polarity by connecting battery clips to vehicle battery\"\u003e\n\n  \u003ch2\u003eContinuity Testing for Automotive Circuits\u003c\/h2\u003e\n\n  \u003cp\u003e\n    Continuity testing helps determine whether a wire, switch, fuse, relay path, connector, or circuit section is\n    connected properly. The V100 can help users check whether the connection in an automotive circuit is normal,\n    disconnected, or open.\n  \u003c\/p\u003e\n\n  \u003cp\u003e\n    This is especially useful when diagnosing broken wires, loose terminals, corroded connectors, bad switches,\n    damaged harnesses, and electrical circuits that appear normal but fail under operation.\n  \u003c\/p\u003e\n\n  \u003cimg src=\"https:\/\/m.media-amazon.com\/images\/S\/aplus-media-library-service-media\/4745b559-a860-446f-8fee-ba1a9d1a5d4c.__CR0,0,1464,600_PT0_SX1464_V1___.jpg\" alt=\"OBDMonster V100 automotive circuit continuity test for connected and disconnected wiring diagnosis\"\u003e\n\n  \u003ch2\u003eOnline and Offline Component Activation\u003c\/h2\u003e\n\n  \u003cp\u003e\n    The OBDMonster V100 can activate and test supported components by outputting positive or negative current through\n    the probe. This allows users to check whether an electrical component can operate before replacing parts or\n    tracing deeper into the circuit.\n  \u003c\/p\u003e\n\n  \u003cp\u003e\n    Depending on the polarity of the component contacts, the probe output can be switched to positive or negative by\n    pressing the button. This makes the V100 useful for quick testing of lights, relays, motors, solenoids, fans,\n    horns, switches, and other supported electrical loads.\n  \u003c\/p\u003e\n\n  \u003cdiv class=\"obdm-v100-note\"\u003e\n    \u003cstrong\u003eImportant:\u003c\/strong\u003e Component activation should only be performed on circuits and components that are safe\n    for direct power or ground testing. Do not apply power to control modules, data lines, sensitive sensors, or circuits\n    unless the service procedure confirms it is safe.\n  \u003c\/div\u003e\n\n  \u003cimg src=\"https:\/\/m.media-amazon.com\/images\/S\/aplus-media-library-service-media\/b7b924fd-ffbe-4707-b9d7-cb6172229708.__CR0,0,1464,600_PT0_SX1464_V1___.jpg\" alt=\"OBDMonster V100 online and offline activation testing of automotive electrical components using positive and negative probe output\"\u003e\n\n  \u003ch2\u003eJumper Testing for Faster Fault Location\u003c\/h2\u003e\n\n  \u003cp\u003e\n    Jumper testing helps technicians bypass damaged components or wiring sections to locate faults faster. The V100 can\n    be used to help confirm whether a problem is caused by the component itself, wiring damage, poor connection, bad\n    ground, or missing power supply.\n  \u003c\/p\u003e\n\n  \u003cp\u003e\n    This function is valuable when troubleshooting circuits where the load does not operate normally. By isolating parts\n    of the circuit, users can narrow down the fault area before replacing components.\n  \u003c\/p\u003e\n\n  \u003cimg src=\"https:\/\/m.media-amazon.com\/images\/S\/aplus-media-library-service-media\/6e98d81c-947d-4daa-9e02-0cf2d76433fd.__CR0,0,1464,600_PT0_SX1464_V1___.jpg\" alt=\"OBDMonster V100 troubleshooting with jumper testing to bypass damaged wiring or components and locate electrical faults faster\"\u003e\n\n  \u003ch2\u003eGrounding Test for Poor Ground Diagnosis\u003c\/h2\u003e\n\n  \u003cp\u003e\n    Poor grounding is one of the most common causes of vehicle electrical problems. A weak or unstable ground can cause\n    lights to malfunction, motors to run poorly, relays to behave unpredictably, sensors to give incorrect readings,\n    or accessories to stop working.\n  \u003c\/p\u003e\n\n  \u003cp\u003e\n    The V100 helps verify grounding quality and troubleshoot circuits caused by poor grounding. A good ground condition\n    provides clear feedback, helping users identify whether the ground path is reliable or needs further inspection.\n  \u003c\/p\u003e\n\n  \u003cimg src=\"https:\/\/m.media-amazon.com\/images\/S\/aplus-media-library-service-media\/2ecade67-db88-4593-9c79-274a57b7f623.__CR0,0,1464,600_PT0_SX1464_V1___.jpg\" alt=\"OBDMonster V100 grounding test for verifying good grounding and troubleshooting poor ground automotive circuits\"\u003e\n\n  \u003ch2\u003eDesigned for Real Vehicle Electrical Troubleshooting\u003c\/h2\u003e\n\n  \u003cp\u003e\n    The V100 is built for practical repair scenarios. It can help test circuits from the front to the rear of the vehicle\n    using the extended 5M test lead, making it easier to inspect lighting circuits, trailer wiring, fuse boxes, battery\n    circuits, engine bay components, and rear electrical systems.\n  \u003c\/p\u003e\n\n  \u003cdiv class=\"obdm-v100-dark-box\"\u003e\n    \u003ch2\u003eCommon Applications\u003c\/h2\u003e\n    \u003cul class=\"obdm-v100-list\"\u003e\n      \u003cli\u003e\n\u003cstrong\u003eDC voltage testing:\u003c\/strong\u003e Check vehicle battery voltage and circuit voltage from 0–80V DC.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003ePolarity testing:\u003c\/strong\u003e Identify positive and negative circuits with red\/green LED feedback.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eContinuity testing:\u003c\/strong\u003e Check switches, relays, diodes, fuses, wires, and circuit paths.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eComponent activation:\u003c\/strong\u003e Test supported lights, relays, motors, solenoids, fans, pumps, and horns.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eShort circuit tracing:\u003c\/strong\u003e Help locate the specific position of short circuits and wiring faults.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eGrounding test:\u003c\/strong\u003e Verify ground quality and troubleshoot circuits caused by poor grounding.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eTrailer lighting test:\u003c\/strong\u003e Inspect trailer light connection circuits and rear wiring issues.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eSpark plug checking:\u003c\/strong\u003e Support basic spark plug-related inspection where applicable.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eKey Features\u003c\/h2\u003e\n\n  \u003cdiv class=\"obdm-v100-feature-row\"\u003e\n    \u003cdiv class=\"obdm-v100-feature-box\"\u003e\n      \u003ch3\u003e0–80V DC Test Range\u003c\/h3\u003e\n      \u003cp\u003e\n        Supports a wide DC voltage measurement range for automotive electrical systems, battery circuits, and vehicle wiring.\n      \u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"obdm-v100-feature-box\"\u003e\n      \u003ch3\u003eVoltage and Polarity Display\u003c\/h3\u003e\n      \u003cp\u003e\n        Tests battery DC voltage and circuit polarity with a clear acrylic display, LED front light, and backlit readout.\n      \u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"obdm-v100-feature-box\"\u003e\n      \u003ch3\u003eContinuity Test\u003c\/h3\u003e\n      \u003cp\u003e\n        Helps check whether wires, switches, relays, diodes, fuses, and circuits are connected normally.\n      \u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"obdm-v100-feature-box\"\u003e\n      \u003ch3\u003eComponent Activation\u003c\/h3\u003e\n      \u003cp\u003e\n        Outputs positive or negative current through the probe for testing supported automotive electrical components.\n      \u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"obdm-v100-feature-box\"\u003e\n      \u003ch3\u003eGrounding Test\u003c\/h3\u003e\n      \u003cp\u003e\n        Verifies grounding quality and helps diagnose faults caused by poor or unstable ground connections.\n      \u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"obdm-v100-feature-box\"\u003e\n      \u003ch3\u003e5M Extended Test Lead\u003c\/h3\u003e\n      \u003cp\u003e\n        Covers front-to-rear vehicle testing, making it easier to diagnose trucks, cars, trailers, boats, and motorcycles.\n      \u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"obdm-v100-feature-box\"\u003e\n      \u003ch3\u003eOverload Protection\u003c\/h3\u003e\n      \u003cp\u003e\n        Built-in overload protection helps protect the tester during high-current conditions and provides buzzer warning.\n      \u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"obdm-v100-feature-box\"\u003e\n      \u003ch3\u003eShort Circuit Finder\u003c\/h3\u003e\n      \u003cp\u003e\n        Helps locate wiring faults, blown fuse causes, and abnormal circuit paths more efficiently.\n      \u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n  \u003cdiv class=\"obdm-v100-table-wrap\"\u003e\n    \u003ctable class=\"obdm-v100-table\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eFeature\u003c\/th\u003e\n          \u003cth\u003eDetails\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eProduct Name\u003c\/td\u003e\n          \u003ctd\u003eOBDMonster V100 Automotive Circuit Tester\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eTool Type\u003c\/td\u003e\n          \u003ctd\u003ePower circuit probe tester, automotive test light, voltage tester, short circuit finder\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eVoltage Range\u003c\/td\u003e\n          \u003ctd\u003e0–80V DC automotive electrical systems\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMain Functions\u003c\/td\u003e\n          \u003ctd\u003eDC voltage test, polarity test, continuity test, component activation, grounding test, short circuit tracing, trailer lighting test\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003ePolarity Indication\u003c\/td\u003e\n          \u003ctd\u003eRed LED for positive circuit, green LED for negative \/ ground circuit\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eComponent Activation\u003c\/td\u003e\n          \u003ctd\u003eSupports positive or negative probe output for compatible electrical loads\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eTest Lead Length\u003c\/td\u003e\n          \u003ctd\u003e5M extended detection line for front-to-rear vehicle circuit testing\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eProtection\u003c\/td\u003e\n          \u003ctd\u003eOverload protection with buzzer prompt under excessive current conditions\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eDisplay\u003c\/td\u003e\n          \u003ctd\u003eAcrylic digital display with backlight and front LED light\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eApplications\u003c\/td\u003e\n          \u003ctd\u003eCars, trucks, boats, trailers, motorcycles, RVs, equipment, and automotive electrical systems\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eWho Should Use the OBDMonster V100?\u003c\/h2\u003e\n\n  \u003cp\u003e\n    The V100 is designed for users who need a fast, direct way to test automotive electrical circuits. It is suitable\n    for professional repair shops, mobile mechanics, trailer service users, fleet maintenance teams, and DIY users\n    who regularly work with vehicle wiring and components.\n  \u003c\/p\u003e\n\n  \u003cul class=\"obdm-v100-list\"\u003e\n    \u003cli\u003eProfessional auto repair shops\u003c\/li\u003e\n    \u003cli\u003eAutomotive electrical diagnostic technicians\u003c\/li\u003e\n    \u003cli\u003eMobile mechanics\u003c\/li\u003e\n    \u003cli\u003eTrailer and RV service users\u003c\/li\u003e\n    \u003cli\u003eMotorcycle and boat maintenance users\u003c\/li\u003e\n    \u003cli\u003eFleet maintenance teams\u003c\/li\u003e\n    \u003cli\u003eUsed car inspection professionals\u003c\/li\u003e\n    \u003cli\u003eAdvanced DIY users and automotive enthusiasts\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cdiv class=\"obdm-v100-note\"\u003e\n    \u003cstrong\u003eSafety Note:\u003c\/strong\u003e Always follow proper automotive electrical testing procedures. Do not apply power\n    to sensitive control modules, communication lines, airbag circuits, sensors, or circuits that are not designed\n    for direct activation. When testing components, confirm the circuit design and rated current before applying output.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"obdm-v100-faq\"\u003e\n    \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the OBDMonster V100 used for?\u003c\/summary\u003e\n      \u003cp\u003e\n        The V100 is used for automotive electrical diagnostics, including DC voltage testing, polarity testing,\n        continuity testing, component activation, grounding test, short circuit tracing, and trailer lighting inspection.\n      \u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat voltage range does the V100 support?\u003c\/summary\u003e\n      \u003cp\u003e\n        The OBDMonster V100 supports 0–80V DC automotive electrical system testing.\n      \u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan it identify positive and negative polarity?\u003c\/summary\u003e\n      \u003cp\u003e\n        Yes. The V100 uses LED feedback to help identify positive and negative circuits. Red indicates positive,\n        and green indicates negative or ground condition.\n      \u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan the V100 activate components?\u003c\/summary\u003e\n      \u003cp\u003e\n        Yes. The V100 can output positive or negative current through the probe to activate supported components\n        such as lights, relays, motors, solenoids, and similar electrical loads.\n      \u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan it help diagnose poor grounding?\u003c\/summary\u003e\n      \u003cp\u003e\n        Yes. The V100 includes grounding test support to help verify ground quality and troubleshoot circuits caused\n        by poor or unstable grounding.\n      \u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs it suitable for trailers and motorcycles?\u003c\/summary\u003e\n      \u003cp\u003e\n        Yes. The V100 can be used on many cars, trucks, trailers, boats, motorcycles, RVs, and equipment electrical systems\n        within the supported 0–80V DC range.\n      \u003c\/p\u003e\n    \u003c\/details\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"obdm-v100-cta\"\u003e\n    \u003ch2\u003eOBDMonster V100: Find Electrical Faults Faster\u003c\/h2\u003e\n    \u003cp\u003e\n      The OBDMonster V100 Circuit Tester combines 0–80V DC voltage testing, polarity identification, continuity testing,\n      component activation, grounding test, short circuit tracing, overload protection, and a 5M extended test lead.\n      It is a practical automotive electrical diagnostic tool built to help technicians and serious DIY users troubleshoot\n      vehicle circuits with greater speed and confidence.\n    \u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e","brand":"OBDMonster","offers":[{"title":"Default Title","offer_id":48204788072683,"sku":"CC0192","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/3641\/7003\/files\/1_3bdc08b3-6e5a-4dd1-ac48-646d66f30302.jpg?v=1777971893","url":"https:\/\/obd.monster\/products\/obdmonster-v100-automotive-circuit-tester","provider":"OBDMonster Online Store","version":"1.0","type":"link"}