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Alternator not charging


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Hey Everyone..

i have a 997tt /tip stock .

battery going dead problem , so i replaced with a new batt and check for charging load off 12.8v load on 12.4v on idle (try this in hot and cold condition , increase engine speed does make any different)

Replace with a new alternator still the same problem but slightly increase 13.10v load off and 12.6-8v load on . sometime when switch off the engine and start again it will read 13.6v off 13.10 on

but today it still below 13v .

i try replacing with another new alternator but the result is still the same ,i also try to check for any loose connection or corrosion .(back of the alternator , starter , below the gearbox and battery)

i try compare with few of my fren 997tt all their reading above 13v+ with all acc on.

i done some searching on this issue , most of them is cost by the alternator to batt cable .

Have anyone got this problem solve before , if replace cable do i need to remove the engine or can be done without removing ??

Thank you in advance.


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  • Moderators

Start by checking all the heavy power leads from the battery to the starter and the battery to ground connections, they are a common corrosion point that causes no end of hard to find electrical issues. Even if the cables ends are clean, check the cables for resistance, there should be almost none; if you find resistance, replace the cable(s). All of this can be done with the engine still in the car.

You should also be running in the high 13 to low 14V range with the car idling.

Edited by JFP in PA
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  • 3 weeks later...

Thank for helping ... i clean all the point from the firewall to the alternator and ground cable . now vehcle regulated voltage well over 13v on load . Cheers!!!!


Edited by drewtommy
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