VSTMUS DC 6-42V Automotive Wire Tracer Open & Short Circuit Finder

• Amazon now offers the VSTMUS DC 6-42V Automotive Circuit Tester for open and short circuit detection, now $20.89 (list price $39.99), use promo code UC6C7PWQ.
• Prime members get free two-day shipping, and regular members get free shipping on orders over $35 within the contiguous U.S.
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Editor's Pick: When your car's electrical system has a problem, tracking it down can be exhausting—you could spend an entire afternoon pulling apart the interior and digging through wiring harnesses. Connect the transmitter to the circuit you're testing, then walk along the line with the receiver. Wherever the signal weakens or disappears, that's where the break is. Three adjustable sensitivity levels let you pinpoint the target even in areas with dense thin wires. The high-sensitivity receiver works with an LED light and audible alert, making readings clear and straightforward. When the battery is low, a red light flashes, so you won't run out of power halfway through testing.

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Image from @Amazon, copyright belongs to the original author