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When I turn off the truck everything turns off except the dash lights

Tiny
WESTHACKER
  • MEMBER
  • 1994 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 158,247 MILES
When I shut off the truck, everything turns off except the dash lights. The only way to make them go out is to take the fuse out. My dimmer switch (not for headlights, for dash lights intensity) does not adjust the light level. However, when fully on, the interior light will come on. How can I fix this?
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Sunday, October 2nd, 2016 AT 3:13 PM

7 Replies

Tiny
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  • MEMBER
  • 4 POSTS
A picture of what I am talking about. The roller switch on the right (or top).
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Sunday, October 2nd, 2016 AT 3:16 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
The headlight switch powers it so when you pull fuse out with truck off see if power is still going to fuse if it is it may be a bad headlight switch. Also check ground at right hand back of cab it may be broken wire.
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Sunday, October 2nd, 2016 AT 3:58 PM
Tiny
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Okay. The fuse still had power even after unplugged. Getting a new headlight switch shortly.
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Sunday, October 2nd, 2016 AT 7:14 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,924 POSTS
Hey WESTHACKER,

I found these wiring diagrams for you to help you and Hmac300 find the problem

Please let us know what you find so it will help others.

Best, Ken
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Wednesday, October 5th, 2016 AT 9:31 PM
Tiny
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  • 4 POSTS
Replacing the headlight switch didn't change anything. Also, Ken, your images didn't attach.
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Sunday, October 9th, 2016 AT 4:51 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Did you check the ground where I said also check battery to body ground may be the cause as well. Also check the door jamb switches wires may be rotted off due to age just take them out and see if wires are connected you will have to check both doors or however many you have any one of them can cause this. Check ground from rear cylinder head to body firewall and at data llink connector under dashas well as inner fender well by battery or battery to fender
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Sunday, October 9th, 2016 AT 5:10 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,924 POSTS
Yep sorry about not getting the diagrams up, here they are.

It looks like the DRL module could be causing the problem.
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Monday, October 10th, 2016 AT 8:39 AM

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