Keep blowing my 80a fuse
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Location: Wichita, KS
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We're going to need more info than this. Does it blow as soon as you turn your key to auxiliary? run? Does the truck run for a while before it blows? What does the fuze go to?
#3
#5
If same schematic as 86 4Runner. 80-Amp fuse supplies:
- Engine fuse (15A),
- Defogger (15A for truck), and
- Wiper (15A).
If there is a short in any of those the lower-rated fuses should blow first. UNLESS one of those fuses has been bypassed.
A few things to check which would not cost you a penny:
- Make sure fuses above are not bypassed and have correct rating (double check your schematic, because I'm looking at my 1986 schematic)
- Inspect wiring to back-up switch which could be rubbing/shorting against tranny. See it here.
- Remove fuses to wiper and defogger and drive like usual. Or leave idling and see if 80-A blows again.
Let us know what you find out.
If above does not solve problem, I would suspect something in charging system. Could something in alternator be shorting to ground - like a bad rectifier or bad winding? A bad rectifier should smoke though.
Could battery be bad that it takes too much charging current?
Last edited by RAD4Runner; 02-20-2014 at 04:24 PM.
#7
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