Why Does New GM Truck Trailer Wiring Not Work Great with Circuit Tester
Published 11/01/2023
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.
asked by: Frank C
0
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.
expert reply by:
Jameson C
0
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