Why my cars alternator not charging during drive or reverse it's a toyota...

rockhead

New member
...camry-1988 4 cyl automatic? Normally it's charging 13.6 with light's and A/C on
as soon as I put it drive charging rate drops to 12.4 and after a while drain the battery and engine stops.
What could be the probable cause you think.
Thanks in advance
Fan belt tension is alright ,
Battery is new.
Normal batt volt 12.5
there's a minor tranny oil leak through a small hose from rad to transmission.
Not in motion even in parked position if I put it on D or R charging drops and on N it back.

Thanks a Lot
 
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