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walfreyydo walfreyydo is online now
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Join Date: Mar 2020
Location: Wisconsin
Posts: 700
Garage
Second getting the battery checked. And a correction to your post - you said low rpm doesnt produce enough amps (volts) to charge the battery - even at idle you should have enough voltage to power the battery - it should read at least 13.5volts.

So if you can get the car started (you can even perhaps roll the car and pop the clutch while in 1st with the key turned to "on"). Check the voltage of the car while its at idle by putting a multimeter on the battery - again, it should read at least 13.5 V.

If it does not read 13.5V you have an issue with your alternator OR the ground/power connections to the chassis or to the battery (corrosion should all be cleaned on grounds and on battery terminals).

If the car doesn't start even with jumper cables, you likely have corrosion issues which is limiting the voltage.

Also, it should not take a few hours to charge the battery, more like 10-15 minutes around the block (scary to think you let the car sit and idle for hours but thats another story...)

To me it sounds like you need to investigate corrosion issues to the battery connections or ground/connection to alternator, or a bad battery. Secondarily it sounds like you may have a draw on the battery (which you can test by googling). Third, recommend buying a battery charger or booster (its useful for lots of situations).
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Tyler from Wisconsin, 1989 944 S2 on Megasquirt PNP
Old 03-14-2022, 11:49 AM
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