Join Date: Jul 2012
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The problem turned out to be a bad ground. In case anyone else runs into this I found that if I would pull out one of the turn signal bulbs the remaining one would flash correctly, but they would both go dim if I put the other one back in.
Coming out of one of the wire looms near the trailer plug I did find a small green that wasn't connected to anything, but it didn't seem to make any difference if I grounded that wire, so I may have to check a wiring diagram to figure out what that wire is supposed to be.
After I got all the snow melted from underneath and removed the spare tire I unbolted the black ground wire from the drivers side frame rail, cleaned the bolt, frame, and terminal with a wire brush wheel on an electric drill. Once clean and re-attached everything in now working fine.