Trailer Wiring Harness Adapter Installation - 1999 Nov 01, 2012How to Install a Trailer Wiring Harness Adapter on a 1999 Chevrolet Silverado. Today on our 1999 Chevy Silverado well be adding the Hopkins Adapter Four Pole to Seven Pole and Four Pole, part number 37185. This vehicle was previously equipped with a four pole that was direct wired to the manufacturers harness.4.8/5(360)Category: WiringBrand: Hopkins 1999 Chevrolet Silverado 1500 Trailer Wiring Harness Compare 1999 Chevrolet Silverado 1500 Trailer Wiring Harness brands. Check prices & reviews on aftermarket & stock parts for your 1999 Silverado 1500 Trailer Wiring Harness. Order your parts online or pick them up in-store at your local Advance Auto Parts.
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