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Hi All,

last week a bought a 1995 2500 4x4 cummins auto at auction. today I was chasing wires under the dash and came across 3 wires.

wire #1 is red and starts at the alternator fuse, then runs through a resister on the fender well. from the resister it runs into the cab and ends.

wire#2 is light blue has a tag that say " trailer tow B+", it starts under the dash and runs about 12" into a big bundle a wires.

wire #3 is red, it starts under the dash at alittle box labeled "spd cont". it only runs about 3" and then ends.

my question is what the heck do these wire do? where/what should they be hooked up to?

I found a switch that looks like it had wire 2 and 3 hooked together, any idea what that would do?
 

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does this truck have a trailer brake controller in it, if not it very well could have and just been taken out, thats my best guess.
 

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