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Do I need a bigger alternator?

To: datsun-roadsters@autox.team.net
Subject: Do I need a bigger alternator?
From: Adam Bradley <ambradley@yahoo.com>
Date: Fri, 29 Jun 2001 09:17:12 -0700 (PDT)
I've been putting some miles on my car since the water pump/electric
fan/head gasket/etc. replacement and have found that after long drives
with stereo, electric fan and headlights on the battery is nearly dead.
 It is a new battery and this did not happen before the electric fan.

I'm not an electronics guy.  I have a multi-meter and it says that with
everything BUT headlights on (fan is on) I have about 12.10 volts at
the battery.  If I turn the headlights on it falls to 11.70 or so. 
Does this mean I'm draining my battery faster than I can charge it?

Or, if I'm doing it wrong, can I use a multi-meter to test this, and
what do I do?



=====
Adam
'70 1600 SPL311-28181
http://www.picturetrail.com/abend
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