Question about 1989 Pontiac Firebird

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89 Pontiac Firebird Formula running lights dont work and keeps blowing fuses for it -next step?

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  • dabunker1 Apr 26, 2010

    its not a bad bulb checked all could it be a headlight switch? i've had this problem years back i just cant remember the exact symptoms the car had before switch was replaced about 5 years ago.

  • dabunker1 Apr 28, 2010

    ok i'm going to go through the sequence you explained with each individual light socket. was a little unclear on one thing i should take out every light bulb and then put one in at a time to narrow down a potential bad socket? if so i will be using up many fuses right? lol. while i'm on this comment, regarding the headlight switch, would that continuously blow the fuses if it were bad? just curious. dont want to seem fixed on that necc. thank you

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I have an 89 formula firebird replaced fuel pump this morning and pump only is getting 6 volts instead of twelve. can't hear pump either..what do i do next

Posted on May 29, 2010

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  • Zaraki May 29, 2010

    The wiring down by the starter has a large loom of wires and if they are not secured properly they tend to get cooked by the exhaust manifold, and then the insulation to the wires will crumble off and the exposed wires there can cause a lot of problems with those vehicles. Look for a burned or melted looking wire loom and check the wires inside of the loom where it has been burned for damaged wires. If the wiring checks out alright, then check the ignition module inside of the distributor because the ignition module also controls the fuel pump in that vehicle, you can have the ignition module tested at most auto parts stores for free and it is not very hard to remove or install the ignition module, just be certain that you clean the module mounting surface inside of the distributor before you install the ignition module, and be sure that you use the silicone grease or die-electric compound (which ever one comes with the module) and that you completely cover the mounting surface on the bottom of the ignition module with the silicone grease or the die-electric compound before you install the module into the distributor because it is a heat sink and the ignition module will not take very long to burn out without it. Also, do not over-tighten the ignition module.

  • Zaraki May 29, 2010

    The wiring down by the starter has a large loom of wires and if they are not secured properly they tend to get cooked by the exhaust manifold, and then the insulation to the wires will crumble off and the exposed wires there can cause a lot of problems with those vehicles. Look for a burned or melted looking wire loom and check the wires inside of the loom where it has been burned for damaged wires. If the wiring checks out alright, then check the ignition module inside of the distributor because the ignition module also controls the fuel pump in that vehicle, you can have the ignition module tested at most auto parts stores for free and it is not very hard to remove or install the ignition module, just be certain that you clean the module mounting surface inside of the distributor before you install the ignition module, and be sure that you use the silicone grease or die-electric compound (which ever one comes with the module) and that you completely cover the mounting surface on the bottom of the ignition module with the silicone grease or the die-electric compound before you install the module into the distributor because it is a heat sink and the ignition module will not take very long to burn out without it. Also, do not over-tighten the ignition module.

  • Zaraki May 29, 2010

    The wiring down by the starter has a large loom of wires and if they are not secured properly they tend to get cooked by the exhaust manifold, and then the insulation to the wires will crumble off and the exposed wires there can cause a lot of problems with those vehicles. Look for a burned or melted looking wire loom and check the wires inside of the loom where it has been burned for damaged wires. If the wiring checks out alright, then check the ignition module inside of the distributor because the ignition module also controls the fuel pump in that vehicle, you can have the ignition module tested at most auto parts stores for free and it is not very hard to remove or install the ignition module, just be certain that you clean the module mounting surface inside of the distributor before you install the ignition module, and be sure that you use the silicone grease or die-electric compound (which ever one comes with the module) and that you completely cover the mounting surface on the bottom of the ignition module with the silicone grease or the die-electric compound before you install the module into the distributor because it is a heat sink and the ignition module will not take very long to burn out without it. Also, do not over-tighten the ignition module.

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The next step is to pull out the light bulbs and actually check them out, a bulb that is internally shorted, or socket with a wrong bulb (for example, an 1156 bulb in a 1157 socket will cause a short).

Posted on Apr 22, 2010

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  • Zaraki Apr 26, 2010

    It is possible that the headlight switch is the problem, but you should first check for bad wiring to the bulb sockets, make sure and inspect the wires carefully and be certain that the wires do not have missing insulation and exposed wires that are all twisted up together or an exposed wire touching the body somewhere and causing a short to ground. Make sure that there is no missing insulation on the wires where they lead up into the bulb socket, they could be shorting out internally.



    Remove all of the running light bulbs, and one at a time replace each bulb and then turn on the headlights to see if it blows the fuse, you should get to a socket that is blowing the fuse, and if there is no wiring problem with that socket then replace it.

  • Zaraki Apr 28, 2010

    If you had a short in every light socket it would go through a lot of fuses, but that would also mean that the short was in a common location for all of the sockets to be affected, and that would make the headlight switch the most likely suspect.

  • Zaraki May 29, 2010

    The next most common location for the lights to have a short is in the turn-signal switch.

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