Question about 1993 Jeep Grand Cherokee

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My ignition fuse which is a 40 amp fuse continues to blow not allowing me to start the engine. what should I do

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  • dino713s Nov 14, 2009

    Everything else seems to be working fine. I was wondering if you might recommend a good place to start my search for the short.

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You have a short somewhere. Is there anything else that don't work besides the ignition switch?

Posted on Nov 14, 2009

  • Ronado Panaligan
    Ronado Panaligan Nov 14, 2009

    First I want to ask. Does the fuse blow only when you try to start the car? Does it blow as soon as you put it in there even if the ignition key is off? Does it blow when you turn the ignition to on position? So you wont waste a lot of money on fuse. Rig you up a light bulb, you may solder wires to it, or use one in a socket with wires. Connect it to where the fuse is suppose to be. Whenever that lightbulb lights up , thats when the short occurs. It should not be lit when the key is off, nor when the ignition is on the on postion. It should light up only when you are cranking the car. Keep me in touch, I will try to help you out.

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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

I have a 2011 kia Sorento that continues to blow the 40 amp ignition fuse under the hood. Replace the fuse...runs a couple days then blows again. We have replace relays and fuses and checked starter..


Starters will still work when worn but will have increased drag drewing too many amps. which will blow your fuses. before replacing older starter first remove all wire connections shiny clean and replace. make certain starter is tight to block(this is your ground. ) Important to remove ground cable from battery before working on starter.

May 07, 2017 | Kia Cars & Trucks

1 Answer

Blowing 40 amp fuse when trying to start


check that the small wire on the solenoid is not touching the big terminal on the starter solenoid or is not shorting out any where .

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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.

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1 Answer

Diagram of a 2000 chevy express wiring of a starter


( one question i have is every time the ignition fuse blows do i need to replace the starter relay? ) NO ! You have a dead short to ground on one of the circuits that fuse feeds. Do you know how to find a short circuit ? Video's on youtube show how. The fuse that blows ,is it IGN - A 40 amp. located in the under hood fuse/ relay center ? That fuse feeds B+ voltage to the ignition switch ,which powers up other thing's ,fuse's etc.. Not just the starter relay ! I see five other fuse's that get power from that fuse when ignition switch is in the start or run position . In the I/P fuse panel the gauges fuse #4 10amp , air bag fuse #10 10amp , turn b/u fuse #16 20amp. , Plus trans fuse #20 10 amp ! Pull out these fuse an try to start the van. if the ignition fuse doesn't blow the problem is in one of these other fuse circuits. There is one more fuse that get's B+ power from the ignition switch and ign A fuse ,crank fuse fuse #8 10amp. this powers the control side of the starter relay .
You can find a free wiring diagram here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine . Under system click engine , under subsystem click starting. Click the search button then the blue link.
If you pull those fuse's i mention and it still blows the fuse look for a shorted ignition switch or wiring from ignition to the starter relay , not the relay itself. Park neutral safety switch . Isolate the circuit , pull the relay out of it's socket ,pull the crank fuse #8 in the I/P fuse box. with a ohm meter check to see if that part of the circuit is shorted to ground. Do you know how to do that ? Do you have a volt ohm meter ? You can buy one cheap at parts store .

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1 Answer

40 amp ignition fuse keeps blowing


U have a positive wire making ground

Jul 30, 2012 | Jeep Cherokee Cars & Trucks

1 Answer

I havea1991 toyota corolla stationwagon that while i disconected the botom ignition harness that is located on the bottom of the key ignition , accidentally grounded the blue whire that has a red stripe ,...


The BLUE/RED wire from your ignition switch provides power to your cigarette lighter and your radio via the 15 Amp "CIG" fuse and the 7.5 Amp "RADIO" fuse in the fuse block under the left end of the dash in the kick panel.

However, this wire will not have any power with the ignition switch removed and therefore would not have been able to blow any fuses with the switch removed. The two fuses that the BLUE/RED wire go to will also not cause your engine to not start.

If your radio does not work and your engine does not start, you probably accidently grounded the WHITE wire. This is one of the TWO power wires going INTO the ignition switch. The other power wire is the BLACK/RED.
The WHITE wire gets power from the 40 Amp "AM1" fuse and the BLACK/RED wire gets power from the 30 Amp "AM2" fuse. Both of these fuses are located in the F.1 fusable link box in the engine compartment at the battery.

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L999 Chevy Cavalier keeps blowing fuses and won't start


you have a SERIOUS electrical problem. - '.
BUT which fuses keep blowing - that is where we need to start.
1. is it the ignition circuit. - - does starter motor turn over when you trun the key.
2. is it the starter relay circuit.
3. is it the starter motor circuit.
4. is it the computer circuit. - - do you have fuel pumping to the engine and cylinders.
5. none of the above. - - do you have spark at the spark plugs.

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2 Answers

40 amp ignition fuse blew. I replaced the fuse and now the lights all go on when the key is turned on but the vehicle will not start...or even try to start. The battery is fully charged.


The 40 amp maxi fuse in the underhood junction block (According to the information I have, there is only one 40 amp fuse in there..) goes directly to the ignition switch. From there, it goes to the buss bar in the Instrument Panel Fuse Block where it feeds several smaller fuses. It also feeds the starter relay in the Underhood Fuse and Relay Center.

My biggest concern would be: What caused the fuse to blow in the first place?

If you get nothing else from my preaching, get this:

Fuses don't blow for no reason....ESPECIALLY not a 40-amp Maxi Fuse!

I can't count how many times I have heard people say: "It's JUST a blown fuse." WHAT???

I have been at this for 35 years and I can tell you that blown fuses are reason for major concern in my book. That 40-Amp Maxi Fuse just saved your truck from burning to the ground and you need to find out why!

The only way that fuse is going to blow is if there is a direct short to ground between the Underhood Fuse and Relay Center and the Instrument Panel Fuse Block (The only "component" between these two is the ignition switch.) or if the secondary side of the starter relay circuit is shorted to ground. The secondary side of the starter relay feeds the "S" terminal of the starter solenoid. (at the starter)

I think the first place I would look for the problem would be the circuit between the starter relay and the starter. It is likely to be shorted against the exhaust or engine block. If this is the case, it most likely fried the starter relay in the process. (which is why the fuse no longer blows and the engine no longer starts)

Aftermarket remote starting units are also usually tied into this circuit. If your vehicle has one of these, it could very likely be the original source of your problem.

At any rate, there should be no rest, truck running or not, until the reason for the blown fuse is found. You will most likely get the truck running in the process of locating the reason for the blown fuse.

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1 Answer

Ignition switch fuse terminal is blowing red 40 amp fuse when i try to replace it


A fuse that is consistently blowing is telling you that there is a short in that system. Don't attempt to bridge it or use a larger amp fuse or you will have a major problem. You will need to start tracing wiring to destinations to find the short. If while moving harnesses around problem ceases to exist, look at nearby items where you are working and try to locate what was grounding. Sometimes people will stop if short disappears, leaving open the possibility of it happening again.
If you are not comfortable working with wiring, then leave it to professionals who do this every day. It's not really difficult but requires patience and a good bit of knowledge to do this right!

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