I have a 2000 olds alero and the signal light only work sometimes, What would cause that?
short circuits in the turn signal and brake light circuits
The most likely cause is the turn signal flasher.
could be several things, I would start with the dimmer switch.
You have a turn signal light-bulb out .
Loose connections or worn parts in the light switch.
The tail light bulb is probably okay, it's the front signal light that is burned out, this would cause the rear light to blink rapid.
multi switch is bad
If the signal light fuse is blown all the signal lights front and rear would not work. If you have one signal light out I would first suspect a bad bulb or bad connection.
Try replacing the turn signal flasher sometimes a near defective one with cycle
A short in either the multifunction turn signal switch or a short in the wiring harness going to the switch.
Most likely turn signal flasher
Okay, first turn the signal on. The look to see if the lights are blenking If the outside lights work then the little light in the dash is out. If the lights outside don't work you either wire problems or you need to replace the light socket. Don't forget to check the signal flasher relay.