Question about 2002 Chevrolet Express

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2002 chevy van 2500 when i turn key to start van

2002 chevy van 2500 when i turn key to start van it blows 40 amp fuse under the hood. Electrical problem?

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SOUND LIKE ELECTRICAL PROBLEM IN THE STARTER CIRCUIT.CHECK WIRING TO STARTER AND CHECK STARTER SOLENOID.

Posted on May 05, 2010

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Fuses only blow if-Old,Overheated or you have a Short circuit.
That should be any easy fix,to the extent that there aren't many 40 Amp Fuses and you will need a wiring diagram to follow the problem from the fuse to the cause. If you know what fuse it is, you can guess,but I wouldn't recommend that,it will be time consuming and maybe costly ,if you don't have a test procedure to follow and throw parts at it.
Don't replace the fuse.Their expensive and will keep blowing.

Posted on May 05, 2010

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Posted on Jan 02, 2017

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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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What fuse's ? Ignition , PCM , ? Won't start how ? explain - when you turn key to the start position does any happen ? if nothing happens this is referred to as a no crank - no start , now if the engine turns over but doesn't start , this is referred to as a crank - no start condition. So which does your vehicle have ?

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I checked all the fuses. No fuses are blown. The battery is fully charged & the electrical, lights, & radio all work fine. The 2004 Toyota Sienna van still doesn't even turn


Can be a bad contact in one of the cables. A bad contact in a switch or electronic switch. a bad relay, and a dozen other causes.
Please start measuring to where the power comes and where it stops. You are close to the car, we are not. For a correct diagnose use a multimeter and look under the hood.

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It will most likely be a poor earth issue, make sure the earth lead between the battery and the body is good and clean and check the one between the body and motor.
Poor earth connections cause excessive current draw and will blow fuses.

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Ignition switch maybe , GM has problems with switch . Test it ! Do you know how to do automotive electrical testing ? Test main powers to the ignition switch . Back probe the B+ power wires Both are red at the ignition switch ! They get B+ from IGN A & IGN C fuse's in the under hood fuse/ relay box ! One is 40 amp , the other is 20 amp .
This problem your having you say happens when you turn the key , correct ? Turn the key to ? ON - START ? or doesn't matter ? The ignition switch supply's B+ voltage to all the things your losing power to.

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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.

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sounds as if you have a power shortage in the van. first establish what fuse keeps blowing this will help in narrowing down the short.once short is located check all connections ,wires,and plugs.

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