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How to Find an Electrical Short in Your Car

by Contributor

Having problems with a short circuit in your car? Using this method will help you find which circuit has the problem. First, disconnect the positive cable to your battery. Second, using a 12 volt test light, connect the clip to the battery cable. Third, using a pair of vice grips or a small C clamp, connect the probe end of the test light to the positive side of the battery. The light should turn on if you have a radio with a memory. Find you fuse box and remove the fuse from the fuse holder marked radio. After removing the fuse the light is still lit, that indicates there is power being drawn from another circuit. Remove the fuses one at a time until the light turns off. Once it does, diagnose all accessories on that circuit until the problem is found.

Step 1

First, disconnect the positive cable to your battery.

Step 2

Second, using a 12 volt test light, connect the clip to the battery cable.

Third, using a pair of vice grips or a small C clamp, connect the probe end of the test light to the positive side of the battery.

Items you will need

  • 12 volt circuit light
  • fuse puller

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