Question about 1999 Pontiac Firebird

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Headlights stopped working

I just got through changing out the alternator. I disconnected the positive side of the battery while I did the repair. I then reconnected the battery. Everything works great now except my headlights don't work! I can't find any fuse that matches up with them. What is up?

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Working as in they dont flip up? or they flip up and dont light up?
There are relays under the hood for the headlights, there are fuses in the fusebox as well. I have to every once in a while turn my lights off and back on to get them to flip up, not sure why, but havent investigated much past that.

Posted on Sep 03, 2008

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Check all of your fuses and I am not sure why you would disconnect the positive and not the negative wire. You should always disconnect the negative and then the positive otherwise you could still have current going through you car

Posted on May 22, 2009


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Dead battery

What are you doing? Disconnecting the battery terminal while car is running can damage electronics in newer cars!

Just have the battery checked out and then check the charging voltage to draw your conclusion re what is bad.

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Charge not getting from the alternator(new) to the battery(almost new) asking possible troubleshooting and solutions- 2003 Saturn vue awd3.0

Run your vehicle turn on radio headlights wipers heat disconnect the positive side of you battery if the vehicle dies its still your altanator but also check the cable from your altanator to make sure it's not broke anywhere.

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How to ck. & change alternator

before you test the alternator, you should make sure your battery is good and fully charged. auto zone, advance, oreilly, will test both the battery and alternator for free... but if you have a voltmeter... with the car off check the voltage in the battery.. should be around 12.25 to 12.50. Have someone crank the car and watch the voltmeter... when cranking if the battery drops much below 11 volts.. the battery should def be charged and tested.
if the car cranks.. take your voltmeter and hold to the battery.. while running the alternator should be putting out around 13.3 to 14.0 volts.. if you turn the headlights on and it drops below 13 or it isn't putting out at least 13 when running, alternator is most likely bad. disconnect your battery... Negative Cable First Always!! when you do this...when you loosen the positive cable is you slip and hit metal.. it wont ark and possibly fry some electronics...when you hook the battery back up... Positive Cable First Always..same reason..
majority of newer vehicles will just have one belt...serpentine drive belt.. find the tensioner pulley and insert tool and push tensioner back and remove serpentine belt... if you don't work on cars often... take a picture of how the belt was run for when you go to put it back me take a picture unless you do these repairs often. most alternators will have two bolts one on top and one on the bottom... and have a wire connection with an electrical plug and usually a small 10mm or 8mm nut holding wire on the back of alternator... remove wires... remove alternator bolts.. replace in reverse order.. when putting belt back on you need to push tensioner pulley back. Hook your battery back up POSITIVE FIRST ALWAYS! crank and check with your voltmeter... or go have a free test at a local auto parts store!

Sep 12, 2015 | Cars & Trucks

1 Answer

How do I change alternator

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  5. How to Replace an Alternator on a Ford or Mercury
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  • replace-alternator-ford-mercury-800x800.jpgThe alternator in a Ford or Mercury is usually found on the left side of the engine bay.
    The alternator inside the engine bay of any Ford or Mercury vehicle serves essentially the same purpose as the generator did in older cars; it is the electrical power plant for your automobile, turning the mechanical energy of your engine into electrical energy you can use to run your headlights, taillights, radio, etc. When the alternator no longer works properly you will begin to lose the ability to use these electrical systems and the battery will no longer be recharged. Soon, you will not be able to start your car. Have a question? Get an answer from a mechanic now!

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    Things You'll Need

    • Socket wrench
    • New alternator for your car's make, model and year
      • 1 Open the hood and disconnect the negative (black) battery cable from the negative terminal on the car's battery.
      • 2 Pull the belt off of the alternator pulley by first turning the tensioner pulley (just under the alternator) clockwise, using a socket wrench, then using your hand to pull the belt off of the alternator pulley.
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      • 3 Disconnect the two wiring harnesses from the alternator. Both of them simply snap in, so just depress the tabs and pull out the harnesses.
      • 4 Unbolt the three bolts holding the alternator in place, using your socket wrench.
      • 5 Remove the old alternator and replace it with the new alternator. Bolt it into place with the three bolts you removed in the previous step.
      • 6 Push the two wiring harnesses into the new alternator.
      • 7 Turn the tensioner pulley clockwise again, using the socket wrench, then place the belt back over the alternator pulley.
      • 8 Reconnect the negative battery cable to the negative battery cable.

    Read more :

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    Jump started 92 ford tempo after it over heated. It ran for a few minutes started overheating again i turned the car off and now it has no power at all wont turn over ,no dash lights,headlights ,nothing

    The steam and antifreeze probabley shorted out you alternator. This will completely drain the battery. Disconnect power from alternator. here is a wire that goes to the back of the alternator that needs to be removed. It has a red boot over it. There is also a clip plug in the back or side of the alternator that you release and pull out. After disconnecting alternator, charge battery and check to see if you get power. If so replce the alternator and make repairs to stop overheat condition.

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    Changing positive cable for battery

    You need to start with the basics ,get a new cable then only disconnect one side at a time that way you know where to hook it back up.the positive will run to your alternator and your starter so you will need to get under the car.MAKE SURE YOU DISCONNECT THE NEGATIVE SIDE BEFORE DOING ANY WORK AND START AT THE STARTER AND WORK YOUR WAY BACK UP TO THE BATTERY.

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    2004 dodge grand caravan, while driving in the rain or snow the wipers, radio and heater stop working. Sometimes if I stop and restart the car they start working again

    You will nee to have the alternator checked, make sure they test it under a load for a while and also make sure battery connections are good and clean. follow the battery cable, the smaller of the two which is the positive side and cable, there are two positive cables coming off the battery. one goes to starter and the other to the fuse/ relay box, make sure where the cable connects to box terminal that its clean and tight. this problem sounds more like an alternator that stops charging enough under a load. a load is when you are using a lot of accessories like the wipers ,radio, heater and headlights, what happens is the alternator is weak and cant keep up and the computer shuts down things when there is not enough voltage to run them, also the battery should be tested also to make sure its holding a good charge and able to accept the charge. you will need to run the engine and turn on all Assyria's and leave them on for a while and have a volt meter on the battery to check the alternator output. good luck.

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    How to change the alternator on a 1991 amigo

    Here are some steps that you need to do.
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    • Remove drive belt.
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    • Disconnect battery positive cable nut on alternator.
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    • Connect the battery ground cable
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    Bolts broke of alternator causing it to fall and that made the serpintine belt jump off, after that was fix the car would not stop so I got a new battery it ran for a day that night the car died again and...

    sounds like your alternater is not fixed. Your car ran off of battery power till you drained it. Complete alternater repair and charge battery. You can check if your alternater works by starting car and disconnect positive cable if it stays running your alternate is fixed. Shut car off and replace positive cable.

    Oct 13, 2009 | 1998 Lincoln Town Car

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    My 96 lincoln started having problems with the interior lights staying on all the time, then the drivers side window did not work, then the power steering was operating intermittenly and then stopped...

    it is a bad idea to disconnect the battery of a running car. If the alternator is working it can destroy virtually any electric component that is on. Alot of shops and some auto parts stores offer free charging/starting system tests.(they sell more baterries and alternators)

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