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Old 08-07-2014, 07:19 PM   #1
lews930
 
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Exclamation Brake controller blows fuse

Hi everyone. I searched a little but didn't find a related thread.

in my 97 12v my brake controller (brand new) blows the brake light fuse when the brake pedal is pushed. It is wired in correctly. Only 4 wires and yes I'm using the factory dodge plug. I tried another brake controller and it still blows the fuse.

If I disconnect the brake controller I have no issues even when a trailer plug is connected.


Any ideas suggestions rude comments?

Would like to add that the brake controller used to work fine

thank you
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Old 08-07-2014, 07:48 PM   #2
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Something is backfeeding ground into the brake circuit. When you depress the brake pedal the circuit is made and blows the fuse. Look for a pinched or rubbing wire in the brake circuit would be my suggestion/guess. Either this or an undersized fuse?
 
Old 08-07-2014, 07:50 PM   #3
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Sounds like the brake wire is grounded, you could hook the truck up to another trailer to verify.
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Old 08-07-2014, 08:13 PM   #4
bigdaddys

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Borrow someone's power probe.
 
Old 08-07-2014, 10:47 PM   #5
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Quote:
Originally Posted by bigdaddys View Post
Borrow someone's power probe.
Ditto on the power probe. Very useful. Ditch the test light.
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Old 08-08-2014, 05:40 AM   #6
lews930
 
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Thanks for the info.

Fuse is correct 25 amp.

The fuse will blow without a trailer hooked up
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Dodge 3500 12v, 6 speed (R.I.P.)
2003 john deere 5105
2005 john deere 6420
2012 john deere 6430
2007 kubotoa rtv
1991 Toyota pickup with VW TDI power

NOT a diesel pro but learning
 
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