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50 amp blower fuse blows instantly - 1999 GMC Suburban

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Unplug blower motor see if it blows then if does the resistor board is gone in it that controls the blower fan high med. low switch

Posted on May 02, 2015

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Posted on Jan 02, 2017

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2 Answers

Will it hurt to replace the 20 amp fuse in my cigarette liter to a 25 amp it keeps blowing fuses


I am wondering if the fuse blows instantly or whether it lasts a while?

Fuse ratings for cars are usually mean or average values so a 20 amp fuse needs roughly 40 amps to cause it to instantly fail. I have not heard of a cigarette lighter needing that much current so I guess there is a fault that should be located and cured before you have a fire.
Maybe it is the element that is faulty...

I think fitting a 25 amp fuse would be slightly foolish...

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I would suspect a short in the blower motor. Lower speeds are through resistors, high speed is direct to the motor. Unplug the motor and try going through the speeds.

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Blower is bad. That's the only thing that could blow a big fuse like that. Besides a shorted wire. You would have smelled burning rubber with this.

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BY you references to what you have done you have eliminated to fault to the front blower . So I suggest that you concentrate your efforts there. The motor be seized up and is drawing excessive current just to work. There may be a problem with the motor speed control shorting out,or a power wire to the motor worn though and shorting out to an earth point.

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Have you replaced the blower resistor . some times they can cause the fuse to blow . You may need a muiltmeter to test the current draw on the blower motor circuit. the draw should be less then half of the rated fuse .( 20 amp fues draw is less then 10 amps) You did not say but does the blower work on high only or the lower speeds with out blowing the fuse ? if it does work on low or high with out blowing the fuse i would replace the blower resistor

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WHEN I TURN ON THE BLOWER MOTOR IT INSTANTLY BLOWS BOTH THE BLOWER MOTOR FUSES ANY SUGUSTIONS ON WHERE I CAN START TO LOOK FOR A PROBLEM I ALSO UNPLUGED THE MOTOR WIRE AND TURNED IT ON AND IT STILL BLEW...


The purpose of a fuse is to protect the wiring in a circuit. If it blows it is because of an overload which would occur if the blower motor is siezed or there is a short in the wiring. My first instinct is a problem with the blower motor. Try isolate the blower - disconnect the leads to the motor - and try switch it on. If the fuse blows again the problem would then be a shorted wire.

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1 Check your 50 amp fuses red AC or Blower
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