Question about 2003 Ford Taurus

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Starter relay, ignition switch 40 amp fuse blows when starting

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On my 2000 ford taurus the starting system white/pink line went to the transmission range sensor or(neutral saftey switch), It was the switch that was intermittantly shorting the starting circuit.

Posted on Oct 05, 2012

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Posted on Jan 02, 2017

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SOURCE: 20 amp ignition fuse keeps blowing

I'm curious, does this vehicle have an alarm/remote starter? If so I expect the installer didn't wire it correctly ... it was an all too frequent issue, with inexperienced installers we had .... I would first suspect any add-on device first (if any) ... In answer to your question ... I know it does have a relay (Starter solenoid is a relay and built onto the starter) As far as it being a relay or the IGN switch ... I'm skeptical.

Posted on May 05, 2009

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SOURCE: 1996 chevy s10 will not

check the crankshaft sensor

Posted on Aug 14, 2008

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SOURCE: 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!

Posted on Apr 18, 2009

  • 226 Answers

SOURCE: 1999 Chevy Venture 40 amp fuse keeps blowing when

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.

Posted on Aug 16, 2009

Testimonial: "Excellant suggestion. One of the wires was exposed due to rubbing against the brake lines hence the 40 amp. fuse was blowing. This was finally fixed."

pepsiman1967
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SOURCE: What could cause a 40 amp ignition fuse to keep

There may be several issues causing you problem. One is that you have a bad connection either on the battery or on the starter or even a bad battery cable. I would suggest removing the battery cables, If it's side post a 5/16 wrench or socket. If it's a top post then it's likely to be 7/16 or 10mm. Using a terminal brushf009f91.jpg clean both the negative and positive terminals. But before reconnecting them, inspect the cables from the battery to their respective connection points. (The starter and the block) Make sure they do not have any broken insulation or dark discolorations in the insulation which represents excessive heat and a weak spot in the cable. Also check and clean the connecting points. Using a socket to remove the ground cable, once removed use a stiff wire brush to clean the surface of the block, then reconnect to the block. Then move to the starter, Using a 5/16 remove the solenoid wires and a 1/2 or 9/16 to remove the battery cable from the starter. Again use a wire brush to clean both surfaces and check the cable ends (eyelets) for a good connection. then reinstall the cables.
I am not sure how they tested your starter, however I have seen several auto parts stores use a diagnostic load machine that checks the starting system without the removal of the starter. If this was the test performed this is not an accurate test for a starter. The Starter will need to be removed, taking the positive cable loose from the battery, then remove the battery cable from the starter with a 1/2 or 9/16 generally socket and a 5/16 generally for the solenoid wire. Once the wires are removed you will have two 9/16(generally) bolts that can be removed with a socket and ratchet. Once the bolts are removed the starter will already be wanting to come out. Remove the starter and take it in to a reputable Auto parts store and ask them to perform a load test. This load test will give you the exact amp draw of the starter and solenoid and then they can tell you if it exceeds the manufactures spec.
Thanks, Dorrian


Posted on Aug 11, 2010

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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 !

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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.

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Could not find a main fuse in the diagrams I looked at. I would take a test light and go through the underhood fuse blocks and see if they are blown.

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40 amp ignition fuse keeps blowing on my 1998 Chevy ST 2WD


You have a short to ground on that circuit , find a wiring diagram an see what all is on that fuse . So far I see the ignition switch an starter relay ! Does it blow right away when you replace it or do you have to turn on the ignition switch ?

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I have a 2004 Chevy trailblazer no start no crank but if I put key on hot wire the starter it will start I replace new ignition switch and new starter relay b


Before you do any thing check for loose or bad connections. Also check you ground connection to engine. Check Fuses, relay and for a Fusible Link open circuit. Now let me explain what a Fusible Link does. They are short lengths of small gauge wire installed between the Battery and the Ignition Switch, or the Battery and the Fuse Panel. They'll melt and open the circuit before damage occurs in the rest of the circuit. I hope this was helpful you.

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My GMC safari 2004 has been blowing Ignition 1 fuse (40 amps) at the moment I turn key to start position,even without starter disconnected it blowed but i replaced the fuse and i removed the starter r


The problem could be a shorted park netual safety switch . Do you know what a wiring diagram is ? It shows all the componets involved in a electrical circuit ! You IGN.1 fuse 40amp , GM calls it IGN A fuse 40 amp . It feeds the ignition switch and pin 30 at the starter enable relay .When you turn the key to the start position it sends B+ voltage to #8 crank fuse , located in the I/P fuse box ,from there it goes to the park netual safety switch , to pin 86 or 85 of the starter enable relay ! If you pull the relay out of the fuse box an look on the bottom you will see this four set's of numbers ,30,87 & 85 ,86 You can test at the fuse box where the relay plugs in . Here is a video on how to test . The guy presenting the video uses a horn circuit , but it works the same way . It happens a lot , the park netual safety switch shorting out . It may or may not be the problem . VEHICLE RELAYS Operation Diagnosis
Here is a web site for free wiring diagrams
http://www.bbbind.com/free_tsb.html Enter your vehicle info . then under system click on engine , then under subsystem click on starting . Then click on the search button an a link will pop up , click on it .You will see all the componets , connections , wiring colors etc... for the starter circuit for your vehicle .

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1 Answer

Keeps blowing the starter fues


Hi, if you're talking about the 10 amp fuse #12, pull out the starter relay and put in a fresh fuse. Try to start the truck and then check the fuse. If the fuse is OK, get a new starter relay. If the fuse burned without the relay, there is a short between the ignition switch and the starter relay. If you have a manual transmission, you can further isolate the short by pulling the connector off the switch above the clutch pedal. Put another fuse in and try again. If the fuse burns, the short is between the ignition switch and the clutch switch. If not, it's between the clutch switch and the starter relay. Please let me know if you have questions, and thanks for using FixYa.

Jun 19, 2011 | 1992 Isuzu Pickup

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

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It could be either the ignition switch,clutch safety switch(if applicacle)or the starter solenoid,I'm including the circuit diagram for you,one of the 2 or three if it's manual trans has short,if the fuse is blowing as soon as you turn the key on(not engaging the starter)it will be in the switch itself or the clutch safety switch.If it happens when you go to engage the starter it's most likely the solenoid.
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1 Answer

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It sounds like a bad ignition switch or something is grounding out.Try to isolate the problem to key positions.See if the fuse blows when you turn the key to ACC(when your dash lights come on without starting)If the fuse does not blow then when you go to start it and it blows it could be one of many problems,the more common ones could be ignition switch,wiring,starter relay,starter soleniod,or perhaps the starter itself is shorting out,this can sometimes happen when a starter goes bad.

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