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Blew my 40 amp Ignition fuse...

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Old 10-28-2008, 11:25 PM   #1
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Blew my 40 amp Ignition fuse...

The truck is a 2001 4.3L 2wd. I went and picked up some furniture, unloaded it and went to turn back on my truck and the starter did nothing. Today I found the 40 amp Ignition A fuse was blown...

Some background: The last couple weeks the starter has been having trouble turning over the engine. I thought it was the alternator giving out (the voltage sits below 14v once the engine is warm) and it couldn't keep up charging the battery.

Now i'm thinking I have a short somewhere that I need to hunt down so my question is, which wire in the ignition hardness does the "Ignition A" fuse power? More specifically in the harness under the dash.

Thanks
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Old 10-28-2008, 11:27 PM   #2
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Re: Blew my 40 amp Ignition fuse...

do you have a remote start or alarm?
Old 10-29-2008, 12:02 AM   #3
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Re: Blew my 40 amp Ignition fuse...

I have both yes. Anyway to test what's blowing it without wasting money on fuses?
Old 10-31-2008, 08:44 PM   #4
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Re: Blew my 40 amp Ignition fuse...

Well I ripped out my alarm starter because I never used it anyway. The fuses are still blowing. I checked the fuse box and one side of the fuse shows +12v and the other side shows ground (An obvious short), so the question is, where could the ignition wire be shorting?

I need a wiring diagram
Old 11-04-2008, 03:27 AM   #5
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Re: Blew my 40 amp Ignition fuse...

Haynes manuals have some decent wiring diagrams (definately not great but they'll pass)

Autozone's got some online as well, in their repair info section.
Old 11-04-2008, 11:12 PM   #6
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Re: Blew my 40 amp Ignition fuse...

Well I found the problem. Turns out it was that purple wire going to the starter. I couldn't find where it was shorting but after I cut it, the fuse didn't blow anymore. So I re-routed it in a better location and it works again. And yea the wiring wasn't stock so technically it was my fault!
Old 03-30-2013, 11:30 PM   #7
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Re: Blew my 40 amp Ignition fuse...

Hey, I have this same problem. how far back did you cut the purple wiring? I can trace mine all the way till it goes into the main wire grouping then under the dash.
Old 04-04-2013, 03:01 PM   #8
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Re: Blew my 40 amp Ignition fuse...

You can get wiring diagrams at the top of this section.
Old 04-04-2013, 11:32 PM   #9
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Re: Blew my 40 amp Ignition fuse...

So I read the diagram and on the top right where it has the starter listed it has the purple wire going from the starter to the crank fuse and the ignition switch. but just before the crank fuse it has a H1 on the wire. What does H1 mean? Also where is the junction box located? is it the bolt on the firewall with all the positive connections? my engine is the 4.3L auto by the way.
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