7way connector found under bed

[Vmyrhaug]

Can anybo confirm that this is the trailer connection wiring? Here in norway the dealer have connected euro style plug direct too the rear lamps.

 

[Vmyrhaug]

It did have this wiring connected. With a single connector on the side.

 

[Vmyrhaug]

2003 silverado btw. Lb7 engine. 2500hd.

 

[down_hiller]

Yes, thats exactly what mine looks like

 

[2004LB7]

yep. trailer connector

 

[Vmyrhaug]

Nice is there seperate fuses in front for this wiring? The battery + wire, is it direkt too battery or a large fuse?

 

[2004LB7]

pop the cover off the fuse box and find the two studs for aux power and trailer brakes. you'll need to put the fuses in the appropriate location too. the wires should be labeled and tucked between the fuse box and fender if they are not already landed on the studs

 

[Vmyrhaug]

pop the cover off the fuse box and find the two studs for aux power and trailer brakes. you'll need to put the fuses in the appropriate location too. the wires should be labeled and tucked between the fuse box and fender if they are not already landed on the studs

The single connector on side of the 7way. What is that?

 

[Ron Nielson]

Mostly complete wiring diagrams available at this download page : https://www.gmupfitter.com/wp-content/uploads/2021/05/2005_LD_CKFullSizeElectrical.pdf

 

[down_hiller]

The single connector on side of the 7way. What is that?

That is for brake light only signal like if you had a camper shell with the center brake light

 

[Vmyrhaug]

Thanks

 

[dndj]

pop the cover off the fuse box and find the two studs for aux power and trailer brakes. you'll need to put the fuses in the appropriate location too. the wires should be labeled and tucked between the fuse box and fender if they are not already landed on the studs

Stud #1 is a 40 amp cartridge style fuse which feeds the +12v wire in the 7 way trailer connector. Wasn't populated from the factory on mine, but once plugged in, this is a direct connection to the battery.

Stud #2 is a 30 amp cartridge style fuse that feeds battery power to the relay block (interior, by the driver's left foot) where the brake controller harness plugs in. Supplies the +12v to the brake controller, which in turn provides electric brake power in the 7 way trailer connector.