How quickly should the alternator respond to the voltage regulator? Seconds? Milliseconds?
Depending on battery charge, I measure between 13.8 - 14.25 VDC on my Bosch 80A alt (older Saab 900). Seems normal
Turning on any load will drop the V by 0.1 to 0.4 V (and stay there). If the alt was originally putting out 14.00 V DC, prior to load, why doesn't the Voltage Reg direct the alt to 'bring it back up' to 14.00 V, if that presumably was what the batt needed for it's SOC? Is this normal and/or is it a safeguard against overvoltage when turning the load off (seems like the systems should be able to easily handle that)?
Possibly related: whenever I turn on any load, I notice the fuel pump pitch/whine moderately decreases. I've jumpered the fuel pump's leg ground, and the fuel pump's component ground wire directly to the batt neg terminal. Also jumpered the fuel pump to receive direct hot feed from batt positive terminal. Have also replaced, cleaned, secured batt cables, chassis ground, and jumpered various other leg grounds to the batt neg terminal - all with no change to the changing fuel pump pitch.
Other dash lights will slightly dim with an additional electrical load. Engine decreases ~50 - 75 RPM with additional load
Alt belts proper tension and not glazed. Alt amperage output tests good. Connections clean and secure. Nominal AC ripple current
Thanks for any input (posting from public library, so may take a few days to answer any follow-up questions)
Lance