The manual states you must have 3.75 ohms resistance across the field
terminals on the alternator on a series 5. My ohmmeter reads 6.75 to
7.25 depending on who knows what. It varies almost every time I read it.
My local electrical auto guy thinks it's no big deal but I seem to
recall a thread on the board that determined if you have excess
resistance (like I have), it would slowly drain the battery on a daily
basis without any indication of charging problems on the ammeter. When
in use the voltage reading at the battery seems to drop about .02 V
/day. I,ve done the diagnostic steps as per the manual and the
alternator control and field isolating relay seem ok. My ignition
warning light is always on but previous advice seems to point to a
faulty (VB) simulator. I'm recharging the battery every Sunday and
getting by but would like to source the problem. Part of the mystery is
the alternator was new (rebuilt) two years ago with less than 2000 miles
on it since. Does anyone know for sure if my high field terminal
resistance points to a faulty alternator?
Thanks, John Lee for Ryan's series V B395000793 which is purring like a
kitten but electrical production is not keeping up with consumption. The
battery is fine, all terminals have been cleaned, the ammeter is non
stock (VDO 60/60) but so what.
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