Low voltage at connector for trailer lights. 5
I have a Ford F-150 with the towing package. When I hook up the trailer to the truck the running lights will not come on even though the tail lights on the truck are illuminated. The turn signal and brake lights on the trailer work fine, just not the tail lights and running lamps. I checked the voltage at the plug on the truck and it is low at 9 volts. There is continuity between the plug on the trailer and that of the truck. I am unable to get any voltage reading when I tap into the wire on the trailer side of the plug.
I have hooked up the battery directly to the pin on the trailer connector and all the trailer lights illuminate as expected, leaving me to believe the issue is with the truck and its wiring.
Since the truck shows low voltage at the trailer connector what could cause this? Could it be one of the relays or some other component. I spent a whole day trying to figure this out and cannot come up with a reasonable explanation.
Any thoughts or suggestions would be welcome.
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