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OT - More Mack truck trailer wiring - longish
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Posted by Dave (IL) on June 05, 2005 at 06:34:21 from (24.15.101.212):
I posted the following on Big Mack Trucks and then thought, why not here where all the really smart a. er people are :) (just kidding). One response was flip polarity and said "I had a one wire alternator so it didn't need anything to switch" Anyway, here's my post:
I have a 70 R700 and am hooking up my trailer for my skid steer. I'm familar with positive ground from English sports cars and old tractors, but I'm wondering how others deal with it.
First thing was I disconnected the trailer brake battery and hooked things up, and the tail lights woundn't work. Discovered they were LED lights and don't work with reversed polarity. Replace with lights with bulbs.
The battery for the brakes has a diode to prevent discharge to the tow vehicle. I suspect I can flip that, but I'd like to make it switchable, because I still want to pull trailer with my Avalanhe at times. I am trying to verify whether the brake "coils" will work with reversed polarity.
Now I'm dealing with the split brake and turn wiring on the truck. I bought a module - Hobby - for that purpose, but don't know if it will work with reversed polarity and hate to burn it out trying.
Next, I believe, IL law requires the trailer brakes to be working over 3000 lbs. This means I'm going to have to add a brake controller to the truck and this might have polarity issues also.
So I'm just wondering if anyone else has gone through this whole mess before?
I'm new to the Mack. This is the first forum I found. Is this a good place for these kinds of questions?
Thanks to any and all!
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