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Left brake light wont turn on when applying brakes. Its a 2004 Pontiac Aztek, just replaced hazard switch. Tried swaping sockets and bulbs, but it does flash when hazards or the turn signal is on.
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All rear brake lights on the GM vehicle line go through the Directional switch inside the column. I have found this to be bad on some N-Bodies... but also if it has a separate Hazard flasher unit and switch, you may want to try that first.. easier to replace and less expensive... all brake lights and directionals go through that unit as well.
you have a short in one of the light sockets or a worn wire from the wiring harness. could be the flasher assembly. are the turn signals different bulbs from the brake lights? Does using the brakes blow the fuse? (Rear lights or brake light switch on brake pedal). left or right turn signal blowing the fuse will tell which side has the short. 4 ways only, replace the relay.
Have you tried wiggling the hazard light switch? The brake light switch puts 12 volts to the hazard/turn signal switch,and the switch will apply this to both taillights.If you turn on the left or right turn signal,it will only route 12 volts to the other light.If you turn on the hazard lights,it will only allow the 3rd brake to come on due to the brake switch.Often.the hazard light/brake light contacts get corroded due to not being turned on and off regularly.Have someone watch the taillights(or use a mirror) to see if they come on when you wiggle the hazard switch.If it does,turn the hazard light switch on and of repeatedly to clean the contacts.
Have you checked the socket to see if 12 volts is reaching the socket for brake light citcuit? Probe the wires with a 12 volt test light probe (avail from any parts store for about $6)
as for the faster flashing thats as simple as a blown bulb, replace the bulb and see if that fixes the problem, it may fix the lot because the other symptoms you mention are a bad connection, if bulb is fine check the connection isnt loose or corroded over. if it is simply file it back to establish better connectivity,
TEST FRONT RIGHT BLINKER CIRCUIT AND REPLACE THE BULB,,WITH PROPER BULB...A DOUBLE CIRCUIT BULB IN A SINGLE SOCKET WILL DO THAT ALSO A SINGLE SOCKET BULB IN A DOUBLE SOCKET HOLDER....CHECK LEFT SIDE BULB FOR ACURANCY
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