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Keeps blowing 40 amp engine control fuse - 1988 Mitsubishi Pickup

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  • Anonymous Mar 13, 2014

    No acc lights on in the dashboard

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  • Master
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Check for bare wires touching ground

Posted on Sep 13, 2009

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2000 JIMMY 4.3 WONT START AND KEEP BLOWING MAIN 40AMP FUSESE


What all does that fused supply B+ voltage too ? Do you know ? That would be your first thing to find out ! Do you know what a electrical distribution diagram is ? Do you know how to test electrical circuits with a DVOM - digital volt ohm meter ? Do you know what a short to ground is ?
Which fuse ? IGN A - 40 amp ,under hood fuse / relay box ? This fuse powers the Starter Relay and Ignition and Start Switch
Does your vehicle have a manual or automatic transmission ? The starter relay could be shorted inside , It's also located in the under hood fuse box . If you pull the relay out of the box it's plugged into an look on the bottom of it you would see four sets of numbers ! 30 & 87 an 85 & 86 . If you were to jump 30 to 87 in the relay box the starter should spin the engine over , not start an run just spin ! 85 & 86 is the control side . Could be the ignition switch !
That 40amp fuse powers a lot of subsystems !

Here is a web site for free diagrams !
http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine , Under system click on electrical distribution , under sub system click on power distribution . Then click the search button .Click blue links one at a time . First blue link scroll down to the second diagram . You will see Ign A 40 amp fuse at the top of the page .you will also see it powers the igintion switch ,look at last part of ignition switch , when in start or run that 40 amp fuse powers all those other fuse's plus three relays i see there also . A/C compressor relay , rear window defroster relay ,daytime running lights . Any one of those circuits could have your short . You need to isolate the circuits , pull fuse's till the fuse doesn't blow !

May 27, 2017 | Cars & Trucks

1 Answer

1995 Mercury Grand Marquis blowing 40 amp fuse as soon as I turn on ignition


It will help if you can identify the 40 Amp fuse that is being toasted when the key is turned.

I looked briefly at a fusebox diagram and found 3 circuits protected by a 40 Amp fuse. The Lamp circuit protects several circuits which have smaller rated fuses on each separate wire. The 40 Amp protection seems to be a safeguard if all the smaller circuits are active in total. Turning off the automatic headlights, should reduce power drain.

The next circuit is the Rear window defroster. Can easily pull 40 Amps, but once the 40 Amp fuse breaks, it should have no effect on the engine.

The last circuit, on the cars with Trailer Tow or Police package has a
40 Amp fuse on the Battery charge Relay. This is a remote possibility. But the engine should be able to run without an Alternator for several minutes using Battery power.

Have them check the fuel pressure. The Inertia switch could have tripped while the car was being repaired. It does not explain the wiring short, but can explain the no start condition.

Again, if the same 40 Amp circuit is overloading, identify the circuit with the fuse box diagram.

Feb 18, 2014 | 1995 Mercury Grand Marquis

1 Answer

Blowing brake light fuse


you might want in this case try a higher rating fuse, example is if the fuse is 15 amp rase it to a 25 amp fuse,try not to go over 40 amp if possible,if that still blows it is more than likley a shorted switch or a bad relay causing the overload or short. after the fuse change an still a problem chech the relay for the break lights next,these are located in the engine compartment and on some models in the trunk,good luck,Gary

Oct 28, 2013 | Cars & Trucks

1 Answer

40 amp ignition fuse keeps blowing


U have a positive wire making ground

Jul 30, 2012 | Jeep Cherokee Cars & Trucks

1 Answer

94 Jeep Grand Cherokee 4x4 with the 4.0 Keeps blowing the fuse that controls the fuse box inside the jeep, its blowing a 40 amp fuse. I believe there is a short. but i don't where to look.


Get yourself a set of factory wiring diagrams,
otherwise your wasting your time

You have no idea what you working on, without
reference material

Helm.Com

Jun 20, 2012 | 1994 Jeep Grand Cherokee

1 Answer

What causes fuse #5c in my 1996 buick park ave. to keep blowing?


A fuse that keeps blowing is probably the result of a wire that is grounded unintentionally. This would be the result of an exposed power wire touching the engine or body and grounding out. This would cause an excessive power draw and blow the fuse. The other option is that the fuse was lower amps than the original one. check the fuse diagram to see if the amps match up.

May 29, 2012 | Buick Park Avenue Cars & Trucks

1 Answer

40 amp ignition fuse keeps blowing


ok. fuse to WHAT ? 40 maxi fuse takes a lot to blow.

Jan 02, 2011 | 2004 Ford Focus

1 Answer

CAR KEEPS BLOWING 20 AMP ENGINE CONTROLLER FUSE??


What keeps blowing my control fuse on my 1997 Chrysler LHS

Sep 11, 2010 | 1997 Chrysler LHS

1 Answer

1999 Chevy Venture 40 amp fuse keeps blowing when I try to start the van. This happened on three seperate days. I drove 150 miles and stopped the van. The could not start the van again. When I try to...


make sure of two things one is any wires touching at the starter to ground or melted and or is the starter drawing too much amperage causing the fuse to blow.starter may have a dead short in it.

Aug 16, 2009 | 1999 Chevrolet Venture

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