GENERAL MOTORS TRAILER WIRING COLOR CODE
GM UPFITTER - Home
UPDATES AND NEW INFORMATION. Upfitter Switch (9L7) Service Parts Retrofit Kits. It has recently discovered that there is a problem with the list of contents for the Upfitter SERVICE PARTS retrofit switch “kits” for vehicles that were not ordered or built with the 9L7 option discrepancy has been corrected and new part numbers are being generated.
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