I have a 2000 Camaro. My problem is front turn signal/fog light related. First...my fog lights don't come on at all. No biggie but mentioning it due to my second part. With my headlights manually on everything works fine up front. Drive without the headlights on and my parking light/turn signal bulb lights up. Both filaments. The heat from the turn signal filament being constantly on melted the plastic assembly. I have changed them but don't want to always have my headlights on to drive. Any thoughts? Thanks, Frank

Could be a bad multifunction switch or even the flasher relay

I would check your headlight relay switch that is located in your steering colum

All lighting fuses and relays are in a plastic box under the hood close to the battery on top of the inner fender well. Do not mess with the computer, it has nothing to do with the lights. check every fuse in the box under the hood.

With the switch in sidelight or dip

position, pull the switch to its first

position to turn on the front fog lights.

Pushing the switch in or turning it to OFF
or AUTO will turn off the front fog lights (this is for the front)

With the switch in any position except

OFF or AUTO, pull the switch to its

second position to turn on the rear fog

lights. This will also turn on the front fog

lights unless main beam is selected.

Pushing the switch in or turning it to OFF
or AUTO will turn off the rear fog lights (this is for the rear)

Exterior lighting

Exterior lighting switch

A. OFF.

B. Side (parking) lights.

C. Headlights.

D. Auto.

E. Front fog lights.
F. Rear fog lights.

It is the round knob nest to the steering colume

Fog/Driving Light Bulb Size: 880
Here is the rest of the bulb size used in your Montana.
2000 Pontiac Montana Auto Light Bulb Diagram
Low Beam Headlight Bulb Size: 9004
High Beam Headlamp Light Bulb Size: 9004
Parking Light Bulb Size: 4157NALL
Front Turn Signal Light Bulb Size: 4157NALL
Rear Turn Signal Light Bulb Size: 3156
Tail Light Bulb Size: 3057
Stop Light Bulb Size: 3057
High Mount Stop Light Bulb Size: Assembly
Fog/Driving Light Bulb Size: 880
License Plate Light Bulb Size: 168
Back Up Light Bulb Size: 3156
Front Sidemarker Light Bulb Size: 194
Ash Tray Light Bulb Size: 558
Glove Box Light Bulb Size: 194
Map Light Bulb Size: 168
Dome Light Bulb Size: 562
Step/Courtesy Light Bulb Size: 168
Trunk/Cargo Area Light Bulb Size: 212-2
Daytime Running Light Bulb Size: 3157NALL
Thank you for using fixya.

underneath the offending fog light there is an access panel. its held closed with two 10mm bolts. take out the two bolts and reach inside for the fog light. there is a tab you must press inward to turn the the socket. turn the fog light socket and remove it from the fog light housing. replace the bulb, and reverse the steps for reassembly.

It is possibly the light switch that is faulty but before you change this make sure you check all fuses and relative relays

You have daytime runing lights. When you turn the signal off does it just stay on or does it flash? If it just stays on and you have some light dimming problems, it is more than likely a bad ground on the front signal sockets. This can be repaired by cleaning or replacing the sockets. Another cause of this problem can be traced to bad bulbs,a very easy fix.Good luck Moe

More specifically, with the light switch in the "on" position (not the "auto" position), pull the light switch out. First click is the front fogs, the second click is both the front and rear fogs.

The only way a lot of bulbs can burn out at once is overvoltage. Check your charging voltage with the car running, using a multimeter. Should be 13.8 volts; with the car off, about 12.6.