Brad, I also have an 88' Classic, (#180) If you don’t have a copy of Rear Terminal Board schematic (Lug ID’s) & Factory Trailer Plug Drawing, I can PDF a copy for you. Rear Terminal Board schematic may not be exact, but should be Very close, as the Basic Chassis Wiring doesn’t vary a lot in that model year. I pull a 22’ Hallmark style trailer and have had similar issues. Always on the Trailer side of the connection.
Duanne
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1988 102' 40"
8V92 HT740
"Show 488"
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