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Voltage Question [Archive] - StangBangerz Forums
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Her GT
03-08-2007, 12:53 PM
Is it normal for battery voltage to drop from 14.4 to 12.9 when the electric fan kicks on? :confused: I am just curious because I have a new battery, new alternator, new battery cables, new starter & new starter relay and I want to cruise all summer without any charging problems. :D Thanks for any help.
slvr87cpe
03-08-2007, 01:33 PM
is this at idle or moving along and do you have under drive pullies:confused:
NXcoupe
03-08-2007, 02:58 PM
It shouldn't drop that much with just the fan kicking on.
Her GT
03-08-2007, 03:05 PM
is this at idle or moving along and do you have under drive pullies:confused:

It's at idle and yes I have under drive pullies.....
Jeff88coupe
03-08-2007, 03:41 PM
Yes..then that is normal for your setup. With underdrive pulleys your alternator is not generating much current at idle...once you get the revs up it is fine. You will be fine this summer. 12.9V is still above just the battery voltage.
theyallslow
03-08-2007, 08:48 PM
you should be ok, but you could upgrade to another alternator, but i would let it go.
Her GT
03-08-2007, 10:20 PM
Thanks everyone.
Timido
03-10-2007, 10:03 AM
Just watch long trafic jams sitting at idle with the electric fan on.