Brent: What kind of connector does your boat have? The "4 pin flat" is the most common for boat and light utility trailers. Trailers with surge brakes will often use the "5 pin flat", which looks just like the 4 pin flat except it has one more wire. Camping trailers and other heavy trailers equipped with electric brakes will usually have the 7 pin round. Many of the larger SUVs and trucks that come with a "tow package" use the 7 pin round and provide the wiring harness under the dash for an electric brake controller. If you boat has a 5 pin flat then you would have been better off wiring your truck with the mating 5 pin connector rather than installing a 7 pin round and using an adapter. Let me tell you, I have managed to lose or have stolen about a half dozen of those adapters. Don't leave the adapter plugged into your truck and turn your back on it for a moment, even if the boat is still hithced up! I suspect that your problem is that when you installed the 7 pin round receptacle on your truck you simply hooked up the four wires that you had in the old 4 pin flat. You need one more: reverse! The reverse wire connects to the center pin. The documentation on your 7 pin connector probably refers to this as "auxiliary" but common use is for reverse. Tap into your backup light circuit to make this connection.
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