Troubleshooting Lack of 12V Power at 7-Way Trailer ...
It can sense when a trailer is connected based on the voltage draw so it won't sent a signal for 12V when using some testers, especially LED testers because there isn't enough of a power draw. The system requires a power draw on the 7-way and then holding the brake pedal for about 3 seconds until your dash registers 'trailer connected'. At that ...
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