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Originally Posted by ClaudeP
On Sunday, coming back from our first trip with our E-Pro 19QB, we had a message in the Colorado dashboard "Check Trailer Cable". We stopped and checked - sure enough there had been a spark and the upper pin of the cable was black. I unplugged and plugged back in - no further error message.
Yesterday I noticed that the TT's DC is out - there is still DC for the power tongue jack and the inverter does work fine, but everything DC in the trailer's control panel is dead.
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I have a Geo Pro QB which is the same design.
There is a battery disconnect switch located on the frame below the propane tanks so I'd check to see if that's turned on.
When I took delivery of my trailer, the battery disconnect switch was turned off. We did the delivery inspection powered from shore power so everything ran off the converter until I got home. The lights dimmed when running the tongue jack. When I disconnected from the tow vehicle, all lights went out.
The inverter is wired directly to the battery with a fuse mounted to the frame just below the battery boxes.
It is possible that the burn on your 7-pin connector is due to the trying to power the trailer from the tow vehicle with the battery turned off, or the connection just might have been loose. I'd have the parts replaced that have burned pins so you won't have problems in the future. Check the tow vehicle's connector also.
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I checked the fuse in the A beam at the fron of the trailer, it's fine. All breakers and fuses in the panel are fine. I suspect the problem may be with the converter, but I wasn't able to find it.
A couple questions:
1 - Is my diagnostic OK?
2 - Where can I find the converter in an E-Pro 19QB?
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It is located in the fuse/breaker panel just inside the door.
If you have DC when plugged into shore power, your converter is fine.
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3 - Is there something else I missed?
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Power flows from the battery through the disconnect switch and then to two circuit breakers at the front of the trailer. There's one screwed to the frame below the batteries and another under the trailer. One runs the slide, the other feeds the DC input to the power panel at the back of the trailer. Both of these are automatic reset breakers (no reset button).
Use a multimeter or DC circuit tester to trace power until you find the problem.
The power panel has a main 30 amp fuse plus one the shuts down the DC input to the panel with reverse polarity. (This could have happened when the dealer installed the battery, or if you had the battery disconnected for some reason.) I believe the main fuse has an indicator light but the reverse polarity one may not. Remove it and check with an ohm meter or beeper.
It's also possible there is a bad crimp in the wiring to the back of the power panel. You can access it through the bathroom sink cupboard.
Be patient, you'll find the problem with some troubleshooting.