Oh, we towed with a 2002 Trailblazer. One thing to check is the charging current to the bargman. For some reason, while the wiring is all in place the lead to the fuse block is not connected. On our trailblazer this fuse block was under the hood right infront of the driver's seat. The wire with a loop fitting was clipped to the side of the fuse block. I removed the cover and attached the wire under the wing nut on the post and now my TM would charge. I found this out at the National rally in 2006. We had already towed for a year and just figured the charging current was not real strong as everything else (lights, brakes, blinkers, etc.) worked fine.
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