My white back up lights don't turn on when my boat is hooked up.

[thebassn8tr]

When I have my boat hooked up to my factory hitch and wiring harness the back up lights in the tail lights don't turn on when I go down the boat ramp. When I have nothing plugged in to the factory hitch wire harness the tail light back up lights come on. Is it just me?

[loufish]

They don't light up, on the truck? But they do soon as you unhook the trailer harness?
Are you useing the factory 7 pin connector on the truck, and what is the connector type on the trailer?

[thebassn8tr]

Originally Posted by loufish

They don't light up, on the truck? But they do soon as you unhook the trailer harness?
Are you useing the factory 7 pin connector on the truck, and what is the connector type on the trailer?

They only light up when there is no trailer. I'm using the factory 7 pin. The connector type on the trailer is flat. But I have an adapter that goes from the flat plug to a circle plug that fits on the truck. Why?

[thebassn8tr]

Although it is a 7 pin connector, the trailer end has only 4 pins.

[BobNYC]

the 4 pin connector doesn't support back-up lights. It only handles running lights (taillights), brake lights, left & right turn signals.

BTW...I always disconnect the trailer lights when I back down the boat ramp. Most of the other boat owners I know do also.

[thebassn8tr]

Originally Posted by BobNYC

the 4 pin connector doesn't support back-up lights. It only handles running lights (taillights), brake lights, left & right turn signals.

That would be what the problem is. Thanks.

[Grizzlymudder]

but your trucks back-up lights should still come on...