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Well... I fixed it. Ha ha. I feel really dumb here. I checked the signal fuses for the truck and since the plug socket had voltage I assumed it to be a ground issue. Never thought to check in the fuse box for separate fuses. Sure enough my brakes,turns fuse was blown for the trailer plug.
ha ha.... One of those "good job dumbie" moments.
Thanks! I was having a similar issue and found my 25 amp fuse was blown as well!
Same for me..I had the exact symptoms as stated originally in this thread.
It ended up being the 25amp fuse in the fuse block under the hood next to master cylinder.
Was all it was.
There are a lot of things that end up being the simplest fix (fuse)..... In the end, it always seems to be the last thing you check that is the fix..LOL!!