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Electric Brakes and Blown Fuses

Home > Discussion Forum > Mechanic's Corner - Brakes

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Electric Brakes and Blown Fuses Tyler 5-29-01  
I have a 96 Jeep Grand Cherokee which will be pulling a 78 Shasta trailer. Anytime I connect the trailer wiring to my Jeep, a Jeep fuse blows. If I disconnect the trailer ground wire for my electric brakes, everything works fine (except the brakes which are then locked, the tires will not turn).

I have connected other vehicles to the trailer (GMC Suburban, and GMC 1/2 ton pickup) and they work fine.

Any guidance is appreciated...
Re: Electric Brakes and Blown Fuses Kent 5-29-01  
I have a 96 Jeep Grand Cherokee which will be pulling a 78 Shasta trailer. Anytime I connect the trailer wiring to my Jeep, a Jeep fuse blows. If I disconnect the trailer ground wire for my electric brakes, everything works fine (except the brakes which are then locked, the tires will not turn).

I have connected other vehicles to the trailer (GMC Suburban, and GMC 1/2 ton pickup) and they work fine.

Any guidance is appreciated...

It would appear that the wiring problem is on the Jeep's side. I'm wondering why you have a seperate ground for the brakes, they are normally grounded back to the trailer's chassis where they share a common ground with the lights. If you remove what you think to be the brake ground wire and the brakes apply, then that's not the ground wire, else you would have opened the circuit and they could not operate. Normally, a seperate wire,independant of the tow vehicle's wiring, protected by a self-resetting circuit breaker, is run to the trailer connector from the brake controller to operate the brakes. Suggest you start tracing wires on the Jeep to see where the problem lies.
Re: Electric Brakes and Blown Fuses Kent 5-29-01  
I have a 96 Jeep Grand Cherokee which will be pulling a 78 Shasta trailer. Anytime I connect the trailer wiring to my Jeep, a Jeep fuse blows. If I disconnect the trailer ground wire for my electric brakes, everything works fine (except the brakes which are then locked, the tires will not turn).

I have connected other vehicles to the trailer (GMC Suburban, and GMC 1/2 ton pickup) and they work fine.

Any guidance is appreciated...

It would appear that the wiring problem is on the Jeep's side. I'm wondering why you have a seperate ground for the brakes, they are normally grounded back to the trailer's chassis where they share a common ground with the lights. If you remove what you think to be the brake ground wire and the brakes apply, then that's not the ground wire, else you would have opened the circuit and they could not operate. Normally, a seperate wire,independant of the tow vehicle's wiring, protected by a self-resetting circuit breaker, is run to the trailer connector from the brake controller to operate the brakes. Suggest you start tracing wires on the Jeep to see where the problem lies.
Re: Electric Brakes and Blown Fuses Russel 5-29-01  
I have a 96 Jeep Grand Cherokee which will be pulling a 78 Shasta trailer. Anytime I connect the trailer wiring to my Jeep, a Jeep fuse blows.

You need a special trailer wiring kit for these jeeps. They are wired different from anything else on the road. The lites have power at all times and controlled on the ground side. To make lites work on a trailer they have to have a kit installed that runs a hot wire to the battery to run the trailer lites. I would love to know which sanitarium the engineer is being held that came up with this one. Welcome
Re: Electric Brakes and Blown Fuses Russel 5-29-01  
I have a 96 Jeep Grand Cherokee which will be pulling a 78 Shasta trailer. Anytime I connect the trailer wiring to my Jeep, a Jeep fuse blows.

You need a special trailer wiring kit for these jeeps. They are wired different from anything else on the road. The lites have power at all times and controlled on the ground side. To make lites work on a trailer they have to have a kit installed that runs a hot wire to the battery to run the trailer lites. I would love to know which sanitarium the engineer is being held that came up with this one. Welcome
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