10 amp ac fuse blows instantly even when ac is off

Asked by Oct 27, 2016 at 12:25 PM about the 1993 Toyota 4Runner 4 Dr SR5 V6 4WD SUV

Question type: Maintenance & Repair

I have a 1993 toyota 4 runner automatic with 3.0 engine. The 10 amp fuse
behind glove box instantly blows when putting in a new one. The green light
on switch is never on, I have reversed heater and ac relays and unplugged ac
switch and it still blows! I bought it this way so don't know history. I have tried
as high as a 20 amp with the same results.

5 Answers

56,415

I would guess that you have a dead short somewhere in the AC wiring. Installing a high amp fuse could start a fire!

But where!!!! what is after the fuse, nothing before could cause it to blow and its before the switch also! I even bypassed the pressure valve to see if comp would come on but of course it wouldnt if there is no fuse and no power to switch! It has an aftermarket radio and alarm (alarm doesnt work) radio does but cant fathon anything that could of been mis wired installing either! I'm going to remove the alarm tomorrow as it's not needed anyways but know that wont solve my problem! HELP!!!

I did notice tonight that my lights at night when headlamps are on don't light on heater/fan controls. Any clues?

Every thing on heater and blower work correct except the lights and of course ac.

56,415

Trace the wiring out and see what you find. I can't think of any "short" cut to finding a short ;)

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