Alternator trouble

Asked by Jan 27, 2017 at 08:53 PM about the 1985 GMC C/K 10

Question type: Maintenance & Repair

I have a 85 gmc and I've tested the alternator
battery and starter.  All are good.  When I drive and
come to a stop light the interior lights and
headlights dim but when I speed back up all lights
are bright again.  Any ideas where to start?

1 Answer

72,525

Some "flairing" of the lights in relationship to engine speed is normal on a non-computer controlled vehicle. If it's excessive there's a problem. Such as a bad alternator drive belt or serpentine belt tensioner, if equipped. HTH. -Jim

Your Answer

C/K 10

Looking for a Used C/K 10 in your area?

CarGurus has 14 nationwide C/K 10 listings and the tools to find you a great deal.

ZIP:

GMC C/K 10 Experts

  • #1
    tennisshoes
    Reputation
    30
  • #2
    gearheadnard321
    Reputation
    20
  • #3
    Bob Beaman
    Reputation
    10
View All

Related Models For Sale

Used Ford F-100
165 listings
Used Ford F-150
3,218 Great Deals out of 223,765 listings starting at $1,200
Used Chevrolet S-10
12 Great Deals out of 1,207 listings starting at $1,600
Used Chevrolet Corvette
159 Great Deals out of 17,387 listings starting at $3,000
Used Chevrolet Camaro
442 Great Deals out of 31,709 listings starting at $1,450
Used GMC Caballero
14 listings

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.