99 sierra no start

1842 Views 8 Replies 4 Participants Last post by 167camaro, Feb 5, 2007

167camaro

Discussion Starter · Feb 4, 2007

Hi everyone, this is my first post here and i hope it's in the right category. Ok here we go, When i tried to start my truck it tried to turnover for about 1 second then just started clicking like the battery cable might be loose. I tightened the battery cables as much as they would go, and also tightened the pos wire from battery to starter at the starter. It was a little loose. As soon as i turned the key on it popped the 40 amp maxi fuse under the hood labeled ign A. When i say i turned the key on i mean it popped the fuse the second i turned it on, i didn't even get to engage the starter. I have replaced the fuse 3 or 4 times while trying to figure out what is wrong with the same result, immediate blowing of that one fuse. Anyone know what the ign A, fuse goes to. Or any ideas wht it could be. Thanks, Aaron

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84fiero123

· #2 · Feb 4, 2007

Sounds like a short.

Check the cables again and make sure there is no place that they are worn threw. Anyplace along the length of the cable.

It could still be the starter solenoid, as all power to the truck runs threw that.

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ChevyFan

· #3 · Feb 4, 2007

The fuse is getting a huge amount of current through it. if it just started, it could be the starter solenoid that has shorted out. If you can't find any other shorts, consider swapping that piece to just see.

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167camaro

Discussion Starter · #4 · Feb 4, 2007

Okay, thanks for the replies. I have unhooked the solenoid and starter completely, and it still blows the fuse as soon as i turn the key on. Anymore ideas? I'm really at a loss as to what it could be. At 2 bucks a pop for these fuses it's getting expensive.

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bigbass140

· #5 · Feb 5, 2007

167camaro said:
Okay, thanks for the replies. I have unhooked the solenoid and starter completely, and it still blows the fuse as soon as i turn the key on. Anymore ideas? I'm really at a loss as to what it could be. At 2 bucks a pop for these fuses it's getting expensive.

check all grounds under the hood also check the wires on the alternator. it sounds like either a ground or even a short going to the ignition.

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84fiero123

· #6 · Feb 5, 2007

Blowing fuses

167camaro said:
Okay, thanks for the replies. I have unhooked the solenoid and starter completely, and it still blows the fuse as soon as i turn the key on. Anymore ideas? I'm really at a loss as to what it could be. At 2 bucks a pop for these fuses it's getting expensive.

OK now that makes no sense what so ever.

You disconnected the battery cable going to the starter and you are still blowing fuses?

HOW?

Correct me if I am wrong but unless your truck is a lot different than any I have worked on, when you disconnect the positive cable to the starter there is no juice going to the truck at all.

Follow all wires going from the positive battery terminal, one of them has to be shorting out.

A bad ground would not blow fuses.

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167camaro

Discussion Starter · #7 · Feb 5, 2007

84fiero123, on my truck the pos battery cable runs directly to the starter, but splits off twice one smaller gauge wire goes to the fuse center underhood right next to battery. And one smaller gauge wire goes to the Alternator. I have also tried unhooking the alt wires with the same result. I am beginning to think something has shorted out like the computer and is in a state of constant ground. Does anyone think that would be possible?

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84fiero123

· #8 · Feb 5, 2007

167camaro said:
84fiero123, on my truck the pos battery cable runs directly to the starter, but splits off twice one smaller gauge wire goes to the fuse center underhood right next to battery. And one smaller gauge wire goes to the Alternator. I have also tried unhooking the alt wires with the same result. I am beginning to think something has shorted out like the computer and is in a state of constant ground. Does anyone think that would be possible?

Anything is possible on these newer trucks.

Used to be easy to trouble shoot trucks, because they were not as computer dependant.

First I would check the wire going to the fuse box, and I mean really check it good. If it is in a wire loom pull it out and check it.

Now seeing you cannot run a diagnostic because of this problem we have a real problem.

Try calling a couple of dealerships in your area, talk to the head of the service department. Ask him if he has a computer that has been replaced for another reason that you can borrow.

Try other repair shops too.

You have me at a loss here, and I’ve been working on these since 1970, worked for GM assembly plant from 73 to 90.

So my knowledge is limited for anything newer but I try to keep up, friends that own shops and things keep me as informed as they can.

Good luck, man I hate electrical problems.

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167camaro

Discussion Starter · #9 · Feb 5, 2007

Bigbass140 you DA-MAN!!! It was a loose ground at the engine block. Thanks for everyones help. Aaron

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