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Posted on Feb 25, 2009
Answered by a Fixya Expert

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The big 40A fuse under the hood keeps blowing when

The big 40A fuse in fuse box under the hood keeps blowing when i turn ignition

  • 1 more comment 
  • Anonymous Mar 18, 2014

    what causes the ignition fuse to keep burning or blowing

  • Anonymous Mar 21, 2014

    want to split and replace top half of the under hood fuse box on a 2005 cobalt

  • Anonymous Mar 23, 2014

    the ignition c fuse under the hood keeps blowing

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1 Answer

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  • Expert 366 Answers
  • Posted on Feb 26, 2009
Anonymous
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Joined: Feb 22, 2009
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Youll have to probe that elec.circuit to find what is causing your short

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0helpful
1answer

I have a 2000 Buick century custom and I had drained my reservoir. Now everything I attempt to start my car my pcm fuse blows instantly. I've replaced my ignition switch and fixed my ignition column yet...

pcm fuse blows instantly ???? What number fuse , how many amps ? Where is it located ? under hood fuse box . ECM fuse 10amp ,underhood fuse box ???? When does the fuse blow ? when you turn the key to the start position . How about when you turn it to just on position ? Replacing the ignition switch an the column ????? Why did you replace these ? You think it was going to fix the problem ? or someother problem ? Bad computer maybe .
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I have a 2004 chevy surban that keeps blowing the ignition fuse what can cause this

You have a direct short to ground on that power feed circuit . You need to find a power distribution diagram to see what all gets is power from that fuse . Isolate the circuits till the fuse doesn't blow any more , then trace out that circuit that blows the fuse .

Which Ignition fuse ? Which fuse box is it in ? under hood , passenger compartment ?
IGN A
40A
Ignition Switch RUN, START, RUN/START/ACCY
IGN B
40A
Ignition Switch RUN/ACC, RUN/START
Could be ignition switch problem , Chevy has had problems with them .
1helpful
1answer

Remotekey will not work. dashboard indication not lit.only powere steering light no clock or temperature lit. all fuses ok

A fuse can blow but physically look intact. How did you verify the fuses were ok? It could be that the 40A fuse 8 in the engine compartment fuse box has blown.
This supplies multiple circuits which are themselves individually fused in the consumer box inside the car.
The smaller 15A fuse 15 in the consumer box would normally blow under these circumstances but f the horn does not work as well and there are other things you have not listed that do not work like brake lights or headlights, it is definitely the under bonnet fusebox where the problem lies.
Good luck.
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2answers

Ignition fuse keeps blowing

solenoid wire to starter may be shorted at starter..
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1answer

I have a 2003 mitsubishi lancer. Everytime I try to turn my key from the ignition to start my car my fuse 4 (40A) blows up I replaced it twice but the new fuse just keeps blowing up:/ what's going on?...

There is a major electrical fault that keeps blowing the fuse. The fuse protects that part of the electrical circuit, 40 amps is heavy electrical circuit, it it wasn't protected by a fuse it car could catch on fire.
You need to get an auto electrician or your Mitsubishi service center to locate the fault and repair.
If you had a wiring diagram for your car then you can trace the wiring from the 40A fuse to the various components to locate the wiring fault or component fault.
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20A ACC/cig fuse, 40A fan fuse (AC) keeps blowing on 05 Sebring.

Disconnect the cigar lighter and see if the short goes away, I will bet it does.
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No AC blowing in 01 honda accord ..... no air at all...not hot or cold.....nothing

First, check the under hood fuse box, Fuse number 17 (40A) Heater Motor.
If that isn't it, leave a comment and I will investigate further.
Hope this helps you.
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20 amp fuse in the box under hood that keeps blowing

Does it only do this when the heat or A/c is on full blast.. ( I had a few of my customers with this problem and they needed a new blower motor..)
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Ignition module failure how would I know?

All Fuses? Under hood & down by left foot? Sometimes 30/40A fuses can blow & still look OK. Check them with a meter.
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