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Ignition switch problem?

Discussion in 'GM Electrical Tech' started by Steve C., Nov 20, 2011.

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  1. Steve C.

    Steve C. New Member

    Hello all. I have a '92 GMC G2500 Vandura (5.7, 4 spd aod, 180K +) which I use as a work van. I've been having an electrical issue as follows:

    Van was starting and running fine until about 2 weeks ago. I'd started it 4 or 5 times that day with no issues. Got in, turned the key, and got absolutely nothing. No accessories, no start, no warning lights, voltmeter pegged at low end.

    So:

    Checked voltage at battery and terminal block on firewall: 12.6

    Headlights, horn, non-ignition switched accessories all worked.

    Cleaned bat. terminals. Still nothing.

    As I was semi-stranded, I tried a jumper between the horn fuse and the turn signal fuse. This fired up the check engine and seatbelt warning lights and buzzer. Turned the key, and had all electrical accessories again.

    Turned key to start: van started and ran like normal. I was able to drive home with no problems. Had to disconnect the jumper when I got there as the warning lights and buzzer stayed on after turning the key off.

    I was able to use the van by hooking and unhooking the jumper. Alternator charges normally, everything works, just like nothing ever happened. After using it this way for a few days (fortunately I've been very busy and haven't had time to pursue a proper repair), the horn fuse (which I jumpered from) blew while driving. Van died in traffic. Pulled over, jumpered from battery side of fuse, and drove home.

    Any insight as to what's going on here?
  2. Steve C.

    Steve C. New Member

    Update/bump

    Rather than pay a shop the hourly rate to track this down, and since I'm rarely more than 15 miles from home, I've been driving it as is after putting a temporary switch in the jumper wire between the horn and turn signal fuses. It's actually been working fine. No blown fuses, all accessories work, starts every time. I did replace one suspect fusible link coming out of the terminal block close to the battery, but that had no effect on anything.

    One more clue, though, is that if I start it up after sitting for an hour or two and shut it right back off, it doesn't always turn off when I turn the key to off. I can shut it off by turning off the temporary switch. This doesn't happen when I've driven it for a few miles.

    Is this most likely an indication of an ignition switch problem?

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