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How to locate a damaged wire in a car?
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<blockquote data-quote="SoonerP226" data-source="post: 4301297" data-attributes="member: 26737"><p>A test light isn’t always a good option because some wires in a modern car’s wiring harness are carrying lower signal voltage rather than the normal 12V line voltage, so shorting them to 12V ground with a test light can damage the electronics connected to them. That’s probably not the case with wires going to lighting, but it bears mentioning. </p><p></p><p>If you have a multimeter and a roll of 12ga or 14ga automotive wire, it’s easy enough to ohm out a wire if you can find the connectors at either end of it. Just use the roll of wire to make a jumper to reach the far end of the wire and set your meter to ohms, then check for continuity. It won’t tell you where the break is, but it’ll at least tell you which wire is broken.</p></blockquote><p></p>
[QUOTE="SoonerP226, post: 4301297, member: 26737"] A test light isn’t always a good option because some wires in a modern car’s wiring harness are carrying lower signal voltage rather than the normal 12V line voltage, so shorting them to 12V ground with a test light can damage the electronics connected to them. That’s probably not the case with wires going to lighting, but it bears mentioning. If you have a multimeter and a roll of 12ga or 14ga automotive wire, it’s easy enough to ohm out a wire if you can find the connectors at either end of it. Just use the roll of wire to make a jumper to reach the far end of the wire and set your meter to ohms, then check for continuity. It won’t tell you where the break is, but it’ll at least tell you which wire is broken. [/QUOTE]
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