notjustair
Well-known Member
I have a 35 foot deck over that I usually pull with one of the semis hauling bales. I used it
about a month ago to haul a tractor the neighbor (with the Freightliner) and all was well. I went
to hook it to the Dually and the brakes won't work. I haven't hooked it to the 2018 Dually, but I
can't imagine anything is wrong with it since I unhooked the stock trailer to change it over and
it works fine on that. It worked on the 04 Dually that I traded in this summer, so I am sure it
can't be the difference in truck wiring.
It sits out. I am wondering about the breakaway setup. Do those control boxes go bad? When they
do is it a situation where the brakes don't work at all, or do they apply and never release. All
of the other wiring is fine, but the odd thing is that the brakes have red and black wires going
to them not blue, so it is kind of hard to chase (the trailer is an L&L). The breakaway box has
two blue wires going through it. The trailer is grounded through a white wire as usual.
Admittedly, I have always had new large trailers with brakes so never had a need to mess with
them. I don't even know how the magnets work. Are they hot and ground and then the voltage
decreases with use, or are they grounded and voltage is sent to them to apply?
I remember that when I started using the semi there was something that was backwards - that semis
have two of the wires reversed in comparison to pickups. I can't remember what wires it was, but
I had it worked on and since then it has always worked on either of the semis and the pickup.
Worse yet, my trailer dealer that got this one all set up when it was new has since died so I
can't pick his brain!
about a month ago to haul a tractor the neighbor (with the Freightliner) and all was well. I went
to hook it to the Dually and the brakes won't work. I haven't hooked it to the 2018 Dually, but I
can't imagine anything is wrong with it since I unhooked the stock trailer to change it over and
it works fine on that. It worked on the 04 Dually that I traded in this summer, so I am sure it
can't be the difference in truck wiring.
It sits out. I am wondering about the breakaway setup. Do those control boxes go bad? When they
do is it a situation where the brakes don't work at all, or do they apply and never release. All
of the other wiring is fine, but the odd thing is that the brakes have red and black wires going
to them not blue, so it is kind of hard to chase (the trailer is an L&L). The breakaway box has
two blue wires going through it. The trailer is grounded through a white wire as usual.
Admittedly, I have always had new large trailers with brakes so never had a need to mess with
them. I don't even know how the magnets work. Are they hot and ground and then the voltage
decreases with use, or are they grounded and voltage is sent to them to apply?
I remember that when I started using the semi there was something that was backwards - that semis
have two of the wires reversed in comparison to pickups. I can't remember what wires it was, but
I had it worked on and since then it has always worked on either of the semis and the pickup.
Worse yet, my trailer dealer that got this one all set up when it was new has since died so I
can't pick his brain!