4 wires under hood and dash ?

[todd]

anybody tell me what each wire is in the bundle together under hood by the brake reservoir and under dash drivers side i think i saw the same set at the rearby the spare tire as well i think it a red,green,blue and white set dont have my truck right now to be sure on the colors but ive seen em on every superduty ive looked at somebodys gotta know what they are

[Dirk]

Are you talking about these?

[tubular031]

i have those too. did not trace them to figure what they go to, i thought the last owner had an alarm or something that was removed... so what are they?

[mdiesel]

they just go through the firewall and are buy the fuse box i used one for my air horns


Matt

[Rob]

mine has them also, i believe they are the customer access wires or something like that. its so you can install other accessories such as an alarm or other powered items and not have to cut into the factory harness.

[bigcountrysg]

Those are for the trailer brake system. When you add a Trailer Brake Controller you will use those wires. Under the dash they should have a connector on them. When you bought your truck. If you bought it new from the dealer. You should have gotten the other end of the connector. So you can add a brake controller with out cutting into the harness.

[todd]

Originally Posted by dirk0

Are you talking about these?

yep those would be the ones

[todd]

Originally Posted by bigcountrysg

Those are for the trailer brake system. When you add a Trailer Brake Controller you will use those wires. Under the dash they should have a connector on them. When you bought your truck. If you bought it new from the dealer. You should have gotten the other end of the connector. So you can add a brake controller with out cutting into the harness.

ive got the brake control ones as well and they do have a plug these are different they are customer access wires and are marked as such but cant find anywhere what each one does i know the green one must have some kind of tach signal to it because thats where the tach wire to my remote start is hooked