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Why Does New GM Truck Trailer Wiring Not Work Great with Circuit Tester  

Question:

Why do the 7 way testers not work on new chevy gmc trucks. All the lights just blink on the tester but the wiring is good because the lights on the trailers work.

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Expert Reply:

New GM trucks don't have consistent 12 volts on their trailer wiring circuits. While this tends to not be a problem for trailer lighting it does not always work great with more sophisticated circuits like your tester. This is a big issue for camera systems that use the running light circuit for their power supply.

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Jameson C

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