Difference Between Hopkins 37185 and 47185 4-Pole to 7-Way Trailer Connector Adapters

Question:

I am converting my 4-pin to 7 pin on my 2005 F-150 Crew Cab. Will part#47185 work or should I stick with part #37185? Thanks

asked by: John B

Expert Reply:

The part we offer as # 37185 is actually sold by Hopkins as part # 47185 so it's the same exact part. Your truck is prewired for a brake controller installation, but the wiring isn't ran all the way to the bumper. The wiring stops on the driver's side frame rail.

Follow your 4 pole connector to where it plugs into the body harness on the frame rail. The harness feeding that connector from the front of the vehicle will have an orange wire that carries 12-v for trailer accessories and the blue wire for the brake controller output. The blue wire in that harness would connect with the blue wire on the # 37185 adapter, and the black adapter wire connects to the orange wire in the body harness. I'll link to a help article that explains this further.

I've also linked to a video showing a typical installation, which you might find helpful.

expert reply by: Mike L