Something is missing in this story
The 19seventy8 trailer is new to us. Either we didn't notice the sparking before or something changed. We've only towed it home and then parked it in the backyard and started cleaning it up! The PO definitely did some home wiring.
The trailer battery is located on the rear bumper. Positive and Negative run into the nook below the furnace
and then into the OE converter. The positive connects to the black power wire from the loom before the converter. The negative connects into a group of wires. There is no ground to the frame anywhere that I've seen. The group of wires under the driver side of the gaucho look pretty unmolested relative to the photos I've seen here. There's a 20 amp fuse on the black wire, a smaller fuse on the frig black wire, and two groups of grounds in a galvanized junction box.
The PO did add a small fan and a small dvd/tv player into the light
It all seems to work fine if the tow vehicle is not connected via the seven pin connector.
I grounded the battery to the frame and instantly blew the fuse on the positive lead at the battery.
The seven pin on the trailer looks fine to me if a little corroded and may have been dragged once as the metal casing is ground flat but does not appear compromised. And the TV is a honda with 5000 miles and a factory tow package.
By chance did the draw bar on the new hitch get tangled in the wires behind the hitch?
No chance ... the honda factory wiring is very clean
I'd suggest starting with the 7 pin plug connectors and be sure it's not shorted inside the connector, then go on to the other wires.
I am assuming that you plugged the trailer into the tug before you put the trailer down on the ball?
We've tried many combinations!!!
If the seven pin from the trailer is connected to Honda there is arcing at the hitch.
Where the trailers running lights or anything else on at the time?
Is your wiring harness in good condition or are there any bare wires showing or touching the frame of the trailer?
Wire harness from seven pin on trailer to area beneath gaucho all looks very good. Seems like it has something to do with the ground wire via the tow vehicle??
Hows the ground on the trailer?
There does not seem to be any ground to the frame of the trailer.
The PO did not have any fuse / circuit breaker protection near the trailer battery. I added that as I thought the wires looked too tight to the battery so while I was in there... so it seems possible it was arcing and he didn't know it? That said the I haven't seen any wires that look burnt.
The first day we had it home I know I checked the voltage at the battery while the Honda was running and I saw 13.6 V so I was happy. I'm pretty sure that was after I put the fuses in... but the arcing we've seen today does not always blow the fuse but I'm quick to disconnect the battery.
I'm going to check voltage from black to white on the trailer plug with the converter on "batt" and we'll see what that shows. Not exactly sure how to to check for internal shorts in the connector...but I'll think about it!
Thanks so much!!