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hey, I have 99 grand prix SE with a 3.1L and my dash lights are doing that also plus my blower fan for heater will slow down when I come to a stop and then sped back up when I gave it gas plus my dash lights brightened back up also when I gave it gas. Its most likely your Alternator, least that's what my mechanic told me but I myself, just to avoid a run around, I had my Alternator, battery and Serpentine Belt replaced and it doesn't seem to do it near as bad but it still does it some, so I don't know. I hope I helped!? Also, I replaced my Serpentine belt only because I thought maybe my belt was getting worn and slipping possibly. Honestly, I think Pontiac Grand Prix's are junk and expensive to fix, I've had nothing but problems with mine and wish I could get rid of it and if I ever get rid of it, im just gonna take it to the junk yard because I wouldn't sell this car to anyone with as many problems as they have.
What else can I help you with?
How do you dim the dash lights on 1994 grand marquis?
There should be a roll switch right next to your light switch on your dash to dim the lights with.
What could cause the dim lights not to work. Brights are working and driving lights are working in a 94 grand prix Is there a dim light fuse?
The dim lights on a 1994 Grand Prix could go out when the headlamp switch is on if there is a short in the wiring for the headlights. There could also be a problem with the bulbs themselves if they were touched during installation. The oils in the fingers can short out new headlights.
Where is the ground wire for tail lights dashboard lights and blinkers?
I have a 1983 GMC Sierra it has no dash,tail lights an brake lights are very dim
How do you dim the dashboard lights on a 2004 Toyota Sienna?
If you know where to change the odometer/tripmeter display... Instead of pushing that control, turn it counter-/clockwise to dim/brighten the dash lights.
Why are my headlights on my 1997 Grand Prix GTP so dim?
Possible bad ground, maybe the vehicle is running on the daytime running lights only bad switch, the list goes on, time to do some testing...
How do you dim the lights on dash of a Mazda familia?
dial right hand side of the steering wheel
How do dim dashboard lights on a 2011 toyata sienna?
You turn the trip odometer button on the dash.
Why would your car radio dim your dash lights?
because it is using up lots of power :)
Your 2002 trailblazer is missing and the lights look dim on the inside What could be making it miss?
have your battery and alternator checked but first check to see if switch for your dash lights are just turned to dim
Why are the dash lights not working on a 1998 Dodge 1500 you have checked all of the fuses in the truck as well as under the hood They all are fine?
Most dash lights have a setting knob to turn the dash lights on and off and to dim them, maybe this switch is off.
Why do my Buick century dashboard lights don't work when headlights on?
The dash lights will dim when the head lights come on. Check for a dimmer switch on your dash. It allows you to adjust the dash lights so they are not too bright and affect your nighttime vision. It may be set too low.
If the dash lights go out what is causing it on a 1997 Taurus?
You could have a blown fuse, these lights may also have a knob to dim them make sure this is on.
