7pin wiring problem. Please help!
I have a new to me travel trailer. I am having a few issues with the wiring. Let me list those and then I'll list what I have done so far. 1. When headlights are on, running lights are not. 2. Whe...
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Grab a battery jumper cable and find a shiny place on the tow vehicle and then make a shiny place on the TT frame. Connect.
Once you have an absolute known good ground you need to start over.
IF you can open the TT plug while it is plugged into the tow vehicle you can then use a test light to check each pin. Use a 12 volt test light and make sure it shows as brightly on each connection. A voltmeter will lie to you.
Once you are sure the tow vehicle is sending proper signals then go back to any of the tail lights and begin testing there.
Once you have this sorted out you can pull the jumper cable off and if things change you can then address that.
Once you have an absolute known good ground you need to start over.
IF you can open the TT plug while it is plugged into the tow vehicle you can then use a test light to check each pin. Use a 12 volt test light and make sure it shows as brightly on each connection. A voltmeter will lie to you.
Once you are sure the tow vehicle is sending proper signals then go back to any of the tail lights and begin testing there.
Once you have this sorted out you can pull the jumper cable off and if things change you can then address that.
