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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You will need either a planned diagnostic procedure or a trailer tech with that in memory.
Here's how I would proceed if you rolled into my garage: Using the towing vehicle, test all connections at the trailer cable's umbilical scket with either a meter or a light. *Sometimes, a frayed wire inside a wire jacket will cause intermittents so I shake the wires going to the socket while I test.*
If truck wiring is good, I check power wire and ground continuity to all the bulb sockets from the trailer umbilical (you can power them and use your light but that won't check for bad grounds). Check resistance of bulbs for continuity across the filaments. If all checks good, I spray the bulb sockets with an electronic spray (Caig brand-Deoxit), replace bulbs, and check systems. If any bulbs refuse to light, I will go back and troubleshoot that ciruit, starting at the bulb holder.
You stated that you don't have a battery and that one ground wire was left disconnected. I would connect that wire to the frame. Even if you are sure it is meant for the battery (-) polarity, it won't hurt anything to connect it. BTW, you will need a battery to tow, I'm sure you know that.
Here's how I would proceed if you rolled into my garage: Using the towing vehicle, test all connections at the trailer cable's umbilical scket with either a meter or a light. *Sometimes, a frayed wire inside a wire jacket will cause intermittents so I shake the wires going to the socket while I test.*
If truck wiring is good, I check power wire and ground continuity to all the bulb sockets from the trailer umbilical (you can power them and use your light but that won't check for bad grounds). Check resistance of bulbs for continuity across the filaments. If all checks good, I spray the bulb sockets with an electronic spray (Caig brand-Deoxit), replace bulbs, and check systems. If any bulbs refuse to light, I will go back and troubleshoot that ciruit, starting at the bulb holder.
You stated that you don't have a battery and that one ground wire was left disconnected. I would connect that wire to the frame. Even if you are sure it is meant for the battery (-) polarity, it won't hurt anything to connect it. BTW, you will need a battery to tow, I'm sure you know that.
