Alternator Voltage Sense Source ?

[randy h]

USA Federal model, 1995 Geo Tracker, 16 Vlv, MFI, 4X4, 5spd Manual, AC, Pwr Steering.

If I understand things correctly, on the alternator wire harness plug, there is a "voltage sense" wire that the regulator uses to determine how much output the alt should strive for to feed the needs of the vehicle.

I would like to know where that "voltage sense" wire runs to after leaving the alternator. Under dash fuse block? RH Fender fuse block?

I recently upgraded to a GM CS130 105amp alternator. Ironically, it seems to be doing too good of a job now. Shortly after starting the car after sitting overnight, its charging at 15.2 volts with lights and fans and my DC to AC invertor on. After a while it settles back down to 14.9 volts. I am interested in finding where the "voltage sense" source is, to help understand what is signaling the regulator to put out so much voltage after startup.

I have bid on fleebay for a FSM for my car but auction does not end until 6 days from now. And of course my Haynes manual is useless for tracking this wire source.

thanks,
randy

[ranger88den]

See attachments. Isn't the voltage internally regulated inside the alternator?

[randy h]

Thank you Ranger88den.
Looks like my wire runs from alt to fuse block under dash. That will help me, thanks.

Yes the voltage Regulator does indeed regulate the voltage internally, but it makes those decisions based on the source voltage it queries from car.

thanks again
randy

[jtgh]

oem


could be bad battery ground cables too.