SPONSORED LINKS

Headlights dim

Tiny
CHRISTINEFULLER
  • MEMBER
  • 2006 CHEVROLET TRAILBLAZER
  • 58,000 MILES
Headlights dim at random times and now I've noticed at the same time the heater fan power decreases. I've had the vehicle jumped twice in the past three months before I purchased a new battery. Is this an electrical problem, or alternator, or a relay?
SPONSORED LINKS
Friday, December 14th, 2012 AT 1:48 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,758 POSTS
It sounds like the alternator is going bad. When the lights dim, check the alt gauge to see if it is low. With the engine running, it should be producing around 14 volts. With the engine off, it will drop to around 12v.

Let me know what you find.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Friday, December 14th, 2012 AT 1:53 AM
Tiny
TIMBUCK
  • MEMBER
  • 1 POST
  • 2004 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 85,000 MILES
The headlights will only come on bright, when you change the dimmer they go off, no dim lights. Thanks Tim
Was this
answer
helpful?
Yes
No
Monday, May 11th, 2020 AT 12:23 PM (Merged)
Tiny
QUESTIONS32
  • MEMBER
  • 10 POSTS
I am currently experiencing this problem with my 2005 trailblazer and I was wondering if you ever found out what was causing the problem?

I've been to the dealership twice now and they still have no idea so I'd appreciated any information that could help us. Thanks
Was this
answer
helpful?
Yes
No
Monday, May 11th, 2020 AT 12:23 PM (Merged)
Tiny
RGASTER
  • MEMBER
  • 1 POST
  • 2004 CHEVROLET TRAILBLAZER
  • V6
  • 4WD
  • AUTOMATIC
  • 116,000 MILES
While driving to work my dim headlights went out. The bright lights work fine and the fog lights work fine. Just the dim are out
Was this
answer
helpful?
Yes
No
+1
Monday, May 11th, 2020 AT 12:23 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check items in pic under hood fuse box. If ok have multi function switch tested and scanned for codes for body module.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
+1
Monday, May 11th, 2020 AT 12:23 PM (Merged)

Please login or register to post a reply.

Related Headlight Dim Content

Have a Dim Headlight? - Try Replacing This!
VIDEO
Have a Dim Headlight? - Try Replacing This!
Instructional repair video
Headlight Dim or Dull
GUIDE
Headlight Dim or Dull
Dim/dull headlight or headlights can be dangerous as it inhibits the vision of the driver from seeing obstacles in the roadway. Fortunately there are only a handful of...
VIEW MORE

Sponsored links