{"product_id":"universal-12v-automotive-relay-tester-led-indicator","title":"Universal 12V Automotive Relay Tester – LED Pass\/Fail Indicator","description":"\u003cp\u003eQuickly diagnose faulty automotive relays before they leave you stranded. The \u003cstrong\u003eUniversal 12V Automotive Relay Tester\u003c\/strong\u003e (Model CNBJ-707) is a professional-grade go\/no-go tool designed to check the general health and proper functioning of the most common 4-pin and 5-pin car relays — all powered directly by your vehicle's 12V battery. No external power supply needed.\u003c\/p\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003cp\u003eSimply clip the tester onto your car battery, select the correct pin mode (4-pin or 5-pin), plug in the relay, and press \u003cstrong\u003eTEST\u003c\/strong\u003e. The tester automatically:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVerifies the relay's pin configuration against standard automotive relay layouts\u003c\/li\u003e\n  \u003cli\u003eOpens and closes the relay contacts \u003cstrong\u003e10 times\u003c\/strong\u003e to evaluate contact closure and opening speed\u003c\/li\u003e\n  \u003cli\u003eChecks contact consistency across each test cycle\u003c\/li\u003e\n  \u003cli\u003eLights a \u003cstrong\u003eGREEN LED\u003c\/strong\u003e when the relay passes all checks, or a \u003cstrong\u003eRED LED\u003c\/strong\u003e when a fault is detected\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUniversal Compatibility:\u003c\/strong\u003e Works with the most common 4-pin and 5-pin automotive relays\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e12V Battery Powered:\u003c\/strong\u003e Connects directly to your car battery (11V–15V range) — no extra batteries required\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstant LED Readout:\u003c\/strong\u003e Green = Pass, Red = Fail — no guesswork, no multimeter needed\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAutomatic 10-Cycle Test:\u003c\/strong\u003e Evaluates contact timing and consistency for reliable results\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCE Certified:\u003c\/strong\u003e Meets CE safety and quality standards\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Durable:\u003c\/strong\u003e ABS construction, lightweight at just 148g\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThree Relay Receptacles:\u003c\/strong\u003e Accommodates different relay footprints in one unit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e CNBJ-707\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Voltage:\u003c\/strong\u003e 11V–15V (12V car battery)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIdeal Coil Resistance:\u003c\/strong\u003e 20 ohms and above\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e ABS plastic\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 13 × 10 × 2 cm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 148g\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCertification:\u003c\/strong\u003e CE\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBatteries Required:\u003c\/strong\u003e No (powered by car battery)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHow to Use\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eConnect the black alligator clip to the battery's negative terminal and the red alligator clip to the positive terminal.\u003c\/li\u003e\n  \u003cli\u003eThe tester powers up — RED LED illuminates to confirm power.\u003c\/li\u003e\n  \u003cli\u003eIdentify whether your relay is 4-pin or 5-pin and select accordingly on the tester.\u003c\/li\u003e\n  \u003cli\u003ePlug the relay into one of the three receptacles on the tester.\u003c\/li\u003e\n  \u003cli\u003ePress the \u003cstrong\u003eTEST\u003c\/strong\u003e button.\u003c\/li\u003e\n  \u003cli\u003eWait for the result: GREEN LED = relay is functioning correctly; RED LED = relay has a fault or unrecognised pin layout.\u003c\/li\u003e\n  \u003cli\u003eDisconnect the alligator clips and remove the relay when done.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eUse only with 12V car batteries within the 11V–15V voltage range.\u003c\/li\u003e\n  \u003cli\u003eBest results with relay coil resistance of 20 ohms or above.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Universal 12V Automotive Relay Tester (CNBJ-707)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLooking for more automotive and diagnostic tools? Check out our \u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge\u003c\/a\u003e and our \u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e for more professional-grade diagnostic solutions.\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.fueleconomy.gov\/feg\/drive.shtml\" target=\"_blank\" rel=\"noopener\"\u003eFuelEconomy.gov driving efficiency guidance\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What types of automotive relays can this relay tester check?\u003c\/h4\u003e\n\u003cp\u003eA: The Universal 12V Automotive Relay Tester is compatible with the most common 4-pin and 5-pin automotive relays. It features three relay receptacles to accommodate different relay footprints, making it suitable for a wide range of standard car relays used in most passenger vehicles.\u003c\/p\u003e\n\u003ch4\u003eQ: Does the automotive relay tester need its own batteries?\u003c\/h4\u003e\n\u003cp\u003eA: No — the tester is powered directly by your vehicle's 12V car battery via alligator clip leads. The battery voltage must be in the 11V–15V range for accurate testing. No separate batteries or power adapters are required.\u003c\/p\u003e\n\u003ch4\u003eQ: What do the green and red LED indicators mean on the relay tester?\u003c\/h4\u003e\n\u003cp\u003eA: A \u003cstrong\u003eGREEN LED\u003c\/strong\u003e means the relay has passed all checks — pin configuration, contact closure\/opening timing, and consistency across 10 test cycles. A \u003cstrong\u003eRED LED\u003c\/strong\u003e indicates a fault: the relay's pin layout may not match standard configurations, the relay contacts may be damaged, or the timing test failed. Always replace a relay that triggers the red LED.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What types of automotive relays can this relay tester check?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The Universal 12V Automotive Relay Tester is compatible with the most common 4-pin and 5-pin automotive relays. 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