Blown trailer brake fuse

[Dieselnerd]

I recently came back from a 2000 mile tow with no brake problems. The trailer is a new 2006, purchased in January. I parked at my house and moved it a couple of times because of constructing a new trailer parking pad. This past weekend I was driving my truck, not towing, and I noticed there was no display on my Brakesmart. Maybe it happened last time I moved the trailer or maybe not, I never noticed. I used the troubleshooting guide in the Brakesmart book and there was no 12 volts at the control unit. I opened the truck fuse box and the 30 amp trailer brake fuse was blown.



I've looked at all the trailer wiring, no damage. Brakes all work fine if I pull the break away switch. I'll replace the fuse and I bet everything works fine.



What concerns me is what would blow the fuse? No indications of a problem on the Brakesmart display. It's supposed to detect problems with the brake wiring. It would have to be a short to ground to take out the fuse.



Any other ideas or experience blowing the 30 amp trailer brake fuse with a Brakesmart controller? The 15 amp fuse in the Brakesmart did not blow.

 

[jelag]

I've had 2 trailers where the wire that crosses over in the axle has rubbed on the bottom of the tube and worn a hole in the insulation... . we played havic looking for this problem that would just blow the fuse... . once we figured out what was going on... we pulled all the wires out of the axles and inspected them on all our trailers... .



We found all of them worn..... and some with bare wire showing... we put the wire on the outside of the axle... in a plastic tube... . 3/8" air line from side to side held in place with wire ties..... we've had no problems...



You might also look on your new trailer to see if the guys let the wires run through the frame without GROMETS to protect them... I've seen this sevral times in the past... .



You can't inspect these wire enough... ..... just my thought here...