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<DIV><FONT size=2 face=Arial> I read in the Bentley that the generator
rotates 2.3 times the engine speed , My car is an automatic so in park it idles
at 1000 RPM in drive warmed up it is 800 RPM , The generator cut in speed in
1450 rpm. The cut in volts is 12.4-13.1. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial> The reason I brought up the cut in voltage is
if the gen rpm is 2.3 times the engine rpm so at 800 rpm x 2.3 =
1840 gen rpm , note I suppose if the gen belt is deep into the pulley the 2.3
would change. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial> I have a VDO voltmeter and checked it's
reading aginst my DVOM connected at the battery and they read the same.
</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial> What stumps me and I should know this yet
most of my experience has been with alternators. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial> Why at 1000 engine RPM I read 14.2 VDC and at
800 engine RPM I read 14.1 and as I idle at a stop the voltage drops to 13.5 and
the longer I sit and idle it will drop to 12.34 Volts ? As soon as I step on the
gas to drive off it jumps back to 14.2 volts. 14,2 volts is the highest reading
I will get even at 2500 rpm. Once I shut it off with DVOM still connected the
battery read 13.45 volts which is surface charge. It settles to 12.72 Volts over
night. To add I don't drive much or very far so I keep a charger connected on
the 12 volt 2 amp setting on a timer set for 2 hours each day it sits and after
short drives with no less than 4 starts just to keep the battery topped off.
</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial> I know it's charging and I changed the gen
brushes and cleaned every connection on the gen and regulator . What I just
can't get is why will idling in drive at 800 engine RPM why does the voltage
drop from 14.1 to 13.5 then 12.45 volts ? I know the engine RPM when higher the
system puts out more and the reg cuts it down to no more than 14.5 or you would
destroy the battery. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial> Is it that the battery is charged enough that
the regulator drops the voltage to a point just to maintain the battery? I
didn't see it drop to 12.45 volts before yet usually the warm engine RPM is 1000
when warm in drive sometimes 950 now it's 800. I also noticed that the electric
fast idle bypass sat at 1300 rpm for a few minutes now it closes faster since
the weather has warmed up. I know the electric air regulator works yet took
longer to close . At times when I start the car when the engine is cold yet the
outside air temp is say 80* the air regulator never brings the RPM's up past
1000 RPM like it says closed which it shouldn't . I do know when the enines warm
and at 800 rpm if I keep my foot on the brake and bring the rpm to 1000 it's
back to 14.2 volts. I have no idea why the idle was 1000 in drive and now 800
unless it's related to the air regulator that was not fully closing when I set
the idle and I also know that once put in drive from park the load from the auto
trans is placed on the engine and will drop the idle , how much is normal I
can't say. </FONT></DIV><div id="DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2">
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