SPONSORED LINKS

When light switch is turned on just the turn signals work

Tiny
COLLIN LACOBELLI
  • MEMBER
  • 1990 GMC TRUCK
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 232,000 MILES
My brake lights, reverse lights and turn signals work fine with light switch turned off, but when turned on just my turn signals work. Also my parking lights don’t work at all. I have brand new taillight circuit boards and bulbs installed, I also went through the harness at the back of the truck and replaced the ground as well, can’t seem to figure it out.
SPONSORED LINKS
Tuesday, February 11th, 2020 AT 6:06 PM

6 Replies

Tiny
PORTAFISHING
  • MEMBER
  • 37 POSTS
Hello,

Sounds like maybe a multi-function switch issue. Is your headlight switch and blinkers all together?
Was this
answer
helpful?
Yes
No
+1
Wednesday, February 12th, 2020 AT 8:44 AM
Tiny
COLLIN LACOBELLI
  • MEMBER
  • 11 POSTS
The headlight and running light switch is on the dash and the turn signal switch is separate mounted on the steering column.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Wednesday, February 12th, 2020 AT 8:57 AM
Tiny
PORTAFISHING
  • MEMBER
  • 37 POSTS
Okay, does the same thing happen on bright and dim?
Was this
answer
helpful?
Yes
No
-1
Wednesday, February 12th, 2020 AT 9:20 AM
Tiny
COLLIN LACOBELLI
  • MEMBER
  • 11 POSTS
Yes it does.
Was this
answer
helpful?
Yes
No
Wednesday, February 12th, 2020 AT 10:54 AM
Tiny
COLLIN LACOBELLI
  • MEMBER
  • 11 POSTS
I was messing around with it tonight and noticed that the parking, brake and reverse lights are on but are so dim it’s unnoticeable.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Wednesday, February 12th, 2020 AT 6:30 PM
Tiny
PORTAFISHING
  • MEMBER
  • 37 POSTS
Sound like a bad connection, maybe a ground. I'll see if I can find you some wiring diagrams to help.
Was this
answer
helpful?
Yes
No
-1
Wednesday, February 12th, 2020 AT 8:10 PM

Please login or register to post a reply.

Related Turn Signal Switch Content

Turn Signal Switch Replacement
GUIDE
Turn Signal Switch Replacement
A turn signal switch is designed to activate the directional signals either right or left by the driver when desired.

Sponsored links