Electrical

1998 CHEVROLET S-10
110,000 MILES • 4 CYL • 2WD • MANUAL
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FOOTBALLGURU1901
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There is a weird humming coming from the main plug under the dash. Also temp gauge is bouncing up and down. Interior lights dim or non existent, intermittently. Also it's is beeping with no key in ignition and headlights off.
Jun 26, 2011 at 8:43 PM
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JDL
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Any applicable trouble codes. Maybe an ignition switch issue. Maybe the system thinks the key is still in the ignition, when it beeps?
Jun 26, 2011 at 8:47 PM
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FOOTBALLGURU1901
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I unplugged the ignition and the multi function switch problem still occurring. I am thinking short.
Jun 26, 2011 at 8:51 PM
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FOOTBALLGURU1901
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No check engine lights either
Jun 26, 2011 at 8:52 PM
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JDL
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I don't care about the check engine lite, I always check for codes, maybe something pending? It's just a habit, you may need scanner that will show pending codes?

Do you have a dimmer for interior lites? Does it work? As far as interior lites, are you talking about dash or dome lite, everything?
Jun 26, 2011 at 9:08 PM
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JDL
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The diagram below is for instrument illumination
Jun 26, 2011 at 9:15 PM
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JDL
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I tried to post more info with the diagram, site wouldn't let me, anyway, use a voltage tester on the fuse/s in diagram, see if voltage goes up and down. If it does, engine running, check the charging system.
Jun 26, 2011 at 9:18 PM
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FOOTBALLGURU1901
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No pending codes. Won't start at all. Doesnt even attempt to crank. It's all lights interior, headlights. Dimmer switch does work.
Jun 26, 2011 at 9:26 PM
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JDL
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The first thing you need to do is get it to start. Does the battery have a full charge? You can't do anything without a fully charged battery.

What about your security system?
Jun 27, 2011 at 4:29 PM
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JDL
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The passlock security shouldn't have anything to with your starter motor circuit. The purple wire at the starter solenoid S terminal should be hot with key in the crank position, if it isn't backtrack the circuit for voltage. Possibilities, ignition switch--fuses--relay--clutch switch--wiring circuit--starter itself.

Again, if battery doesn't have a full charge and battery connections all clean and tight, we are just spinning our wheels.
Jun 27, 2011 at 4:40 PM
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FOOTBALLGURU1901
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Battery does have full charge? Stumped, thanks for the help, but on the way to the shop now.
Jun 27, 2011 at 5:06 PM
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JDL
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Let us know what they find?
Jun 27, 2011 at 5:23 PM
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FOOTBALLGURU1901
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Will do thanks again
Jun 27, 2011 at 9:24 PM
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JDL
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Your welcome.
Jul 6, 2011 at 3:34 PM
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