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Chevy S10 - GMC S15 and Sonoma Lighting Issues

20 messages,  Last post on Oct 11, 2009 at 10:58 AM

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#1 of 20 Light Weirdness by awade Jun 03, 2007 (4:25 pm)
I have an all original 91 with only 45,000 miles on it. Now when I turn on the head lights the lights come on but the instrument panel lights go out and the interior dome light comes one. I replaced both the head light switch and the panel dimmer switch but no luck. I took the dash out hoping there was something wrong with the printed circuit on the back but could not find anything wrong. Fuses all seem ok and I could see no visable damage to any of the wiring. Any ideas ? I'd hate to have to trace all the wiring. Replies to this message: hoodlatch (Jun 03, 2007 6:18 pm) awade (Jun 04, 2007 5:14 pm) dave8697 (Jul 15, 2007 3:16 pm) awade (Jul 18, 2007 4:49 pm) philscbx (Nov 12, 2007 11:12 pm)
#2 of 20 Re: Light Weirdness [awade] by hoodlatch Jun 03, 2007 (6:18 pm)
Replying to: awade (Jun 03, 2007 4:25 pm) My daughter had a similar problem. The parking lights, turn signals, brake lights, and dash lights all acting weird. At night, the dash lights wouldn't come on unless you put your foot on the brake. When you put your foot on the brake not only would the dash lights come on but also all the turn signal lights would come on.   To make a long story short, her friend replaced one of the tail lights with a wrong bulb. This set up a short in the system, which caused a feedback. After an hour of trouble shooting along with a new fuse and the correct bulb, it was back to normal.   Maybe something like that has taken place on your S-10. Before you do anything radical check the bulbs and sockets to see if one of them is shorted out. Good luck. Replies to this message: awade (Jun 04, 2007 5:14 pm)
#3 of 20 Re: Light Weirdness [hoodlatch] by awade Jun 04, 2007 (5:14 pm)
Replying to: hoodlatch (Jun 03, 2007 6:18 pm) Thanks hoodlatch. I'll try the bulbs in the instrument panel. All the other bulbs, brakes, back up, turn signal, etc. seem to work OK.
#4 of 20 Re: Light Weirdness [awade] by dave8697 Jul 15, 2007 (3:16 pm)
Replying to: awade (Jun 03, 2007 4:25 pm) Have you found your problem cause? I have the same problem. I replaced the switch and the dome light now works. The amber backup light bulb that was put in by the dealer??? was replaced too but it was the correct number (3057) so it wasn't the cause. Come November I'll have to drive in the dark all 46 miles to work at 6:30 AM every day so I'll want a lit speedo by then. Replies to this message: awade (Jul 18, 2007 4:49 pm) philscbx (Nov 12, 2007 11:12 pm)
#9 of 20 Re: Light Weirdness [dave8697] by awade Jul 18, 2007 (4:49 pm)
Replying to: dave8697 (Jul 15, 2007 3:16 pm) No luck yet. Checked every bulb on the dang truck. My back up lights flicker or dont come on at all so I think it may be some sort of short in there. Does your dome light come on when you turn your head lights on ? My does but not at full strength. Almost like its some sort of safety measure since the instrument panel lights dont work. Replies to this message: philscbx (Nov 12, 2007 11:12 pm)
#10 of 20 Re: Light Weirdness [awade] by philscbx Nov 12, 2007 (11:12 pm)
Replying to: awade (Jul 18, 2007 4:49 pm) 99 out of 100, it's always a bad ground when things look alien. Ground will seek out anything to make a circuit, as in making false lights light up, dimming of others and so forth.   Check ground connection at radiator core support from battery terminal. Also add a ground from battery to other body panels, fender, back to the engine anywhere. Use #10 gauge wire. Replace poor looking battery cables.   Sand clean the body ground connection and use a good grease before mounting it.   Good Luck

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