brake controller 90 3500

[Jack-Iowa]

I have a 90 3500 and it supposedly has the towing pkg. Where are all the wires at?

or are there plugs?

thanks

[95Sierra2500]

It's gotta be hardwired in. A wiring diagram will be your best friend, or you can have it installed. It's easier to let the pro's do it.

[Silverado25004x4]

try looking under the hood, right on the firewall, thats where ive seen the wiring on most of the older models, it may only have two or three. having it where you have to run the pw wire to the module. idk but yeah just look under the hood, it might be covered up so check closely

[Jack-Iowa]

well the po said it was under the dash but cannot find anything that looks right.