Question about 1979 Pontiac Firebird

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My battery always going dead..i just replaced it and the alternator is good .i have 1987 firebird.i guess i've got some type of voltafge leakage..i checked all the lights..and everthing still can't find problem

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You need to find a good old fashion shop that can check your car for a 12 volt drain,it can be done it just takes awhile,and it would be very hard to tell someone how who has never done it.as long as your sure your battery is a good one and not a rebuilt one.

Posted on Nov 24, 2009

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97 firebird, won't turn over by key, headlights going up and down like crazy


look at the battery first.. there are two connections.. one a plus and one a minus,, check and clean both of these first make sure they are snug not loose and somewhat clean..check for a good charge also. these batteries go dead quickly in cold weather..usally when the headlights go dead the battery is dead also..(need to charge or jumpstart) if you have a charger connect it and let charge for a while(if not a second running car connected for a while will do) see if the battery is good, if not replace it.. repost findings..

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You need to have the alternator checked. The tachometer runs off signal from the distributor, but can be indirectly affected by the charging system. It may be as simple as tightening the alternator belt, but I would guess that the alternator itself is going bad. Alternators that are marginal in charging ability anyway (old) may just go bad under the load of charging a fully dead battery.

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Check your battery and check the ground wire from battery. Make sure all your wires are clean and good connections. A bad battery will not charge and a dead battery will not charge a alternator maintains a battery not charge a battery, so charge your battery completely before checking that the alternator is working. Check all the wires going to the starter for good tight and clean connections . Hope this helps...

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1 Answer

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1- If the battery is old, some of the cells are dead then it can never be fully charged. 2- There is possible current leakage when the key ignition is out. Here is a check. 3- Take off the wire connection to the alternator. Take off the car key. Use a Multimeter set to current measurement To measure in series from the positive terminal of the battery to the positive cable. ( of course you have to take off the positive cable from the battery.) Your measurement should be less than 15mA, Higher than that you have shortage some where. Starting take off all fuses. one at a time to see the leakage measurement reduce to locate which path is leaking. 4- Keep the measurement set up like this, connect the Alternator wire inis place, look at the muleteer to how is the leakage current measurement. Sometimes the diode in Alternator circuitry leak allow the battery current flow back to the alternator causing battery current drainage. 5- Due to some work involved in testing to find out leakage current, You better be sure your battery fully charged to stay with statement the battery is really good but draining current because of some leakage.

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Help


Hi you should check the alternator, when the charging sistem is defective ,the idle goes up to keep the engine runing ,the battery is not getting charge so eventualy it will go dead.

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