You mean this thread?
I had a similar problem. Test to see whether your 4-to-7-pin adapter picks up the white ground wire from the 4-pin truck end and passes it through to the 7-pin trailer end. Mine did not. I had to ground the adapter separately to the frame of my tow vehicle, and then it worked.
yeah, the guy at the RV place told me I would probably have to manually ground the adapter to the frame. I tried that, but it didn't work. I really am at a loss as to why it won't work. A little history on the vehicle: A few months ago, we had no turn signals or break lights
working on the vehicle, we took it to our mechanic and he said it was the 4 pin tow adapter hooked to the vehicle. Whatever he did to it fixed the problem. We never used it so I figured if he unhooked it, no problem. We buy the scamp
some months later and I notice that the adapter is all corroded, so I wire in a new one.
It's weird, because now I have a battery light
on on the dash and have had to jump the vehicle the last two days. It runs for a minute then sputters and shuts off. I am unable to start it unless I jump it again. Maybe the alternater, I don't know. Whatever it is, the wife is blaming me on the wire job I did, despite the RV guy saying that it is wired correctly. Darn it all...I really want to take this camper out for a trip, but am unable to get this problem figured out. I had a plan to tow the scamp
with the 4runner , down to the RV shop. It's super close by and with the wife following me in our car, I think I could get away with no break lights
or turn signals, but now the 4runner won't even run, let alone start. I always thoguht I had good Karma, maybe I need to rethink a few things.