Trailer wiring

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Turbo4whl

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Downingtown, PA
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Wayne
Truck Year
1974
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Jimmy
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350
Some info that may help with all wiring upfits. I had a trailer with electric brakes for a safety inspection. Trailer brakes would work with the brakeaway cable pulled, but not through the truck/trailer plug. I found the builder used sealacrimp conectors.
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Notice the connector upper left with blue wire. The seal over part of the loop prevented the nut from tightening the nut to the metal loop. You can also see how a new connector, upper right also has sealing plastic on the loop, just not as much.

This trailer, two axle 12x4" brakes has a GVRW of 19,300 pounds. It can carry 3 large cable reels. Here is the factory wired connection box. (I use the word factory loosely)

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bucket

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Hey I've got a somewhat related question that you may know the answer to. We got 4 new International medium duty trucks and we ordered the "in-dash" trailer brake controllers. Well, it turns out, that option simply means that the dealer installs an aftermarket brake controller to the underside of the dash. It's a joke really. But anyway, all 4 trucks will apply braking power to a trailer, but they do not show connection on the controller so it makes it a real guessing game to adjust brake bias. I haven't had much time to investigate... do you have an idea of what they might have done wrong? It's only 4 wires, I don't know what they could have possibly done.
 

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