Question about 1999 Pontiac Montana
Hi as the battery has been changed or off the car then check all the connections are tight also check their is no little wire missing from the live as the little one is the feed from alternator, one way to check if the alt is working is to wait till its dark then start the car and park it so the head lights shine on a wall then turn the on high beam then rev the engine if the alt is working the lights will get brighter when you rev the engine up.
check their are no wires missing or come loose from the alt also check the earth wires from the battery check where they bolt to the body of the car and also the engine or gearbox, remove them give them a clean where they touch the body and eng./gearbox to rule out this causing the problem.
you may find the battery or the alt could be faulty you can test the alt by using a multimeter and check how much volts you have got going back into the battery you should have between 13 and 14 volts going into the batt to ensure its been charged correctly.
let me know what you find out ok, double check all wires and test how many volts you have got going to the battery if its less than 13 then the alt is faulty if its 13 or above then the chances are the battery is no good and needs replacing.
if you give the battery a full charge and start the engine if the alt is not working above 13volts then the battery light will be on inside the car so this would then say the alt is faulty if the light is not on until the battery is totally dead then the chances are the battery needs replacing
let me know how you get on ok or if you need further assistance ok
Posted on Oct 13, 2010
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Posted on Jan 02, 2017
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