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Got it, Thx!

No need to check T1 if using my VR. My VR doesn't use T1. :)

You'll want to test the T1 transformer to be sure it's working. They fail with some frequency.

Looks like someone put a LIBBY AC Voltage Regulator in by mistake! The Transformer T1 in your picture is a TRC Transformer for a TRC AC Voltage Regulator setup. The front panel potentiometer R1 is a 20K ohm one which is for a TRC AC Voltage Regulator setup. You don't have a picture of R16. R16...

That's NOT the test procedure for the LIBBY AC Voltage Regulator. That's one is for the TRC AC Voltage Regulator. The one for the LIBBY is -24 TM dated 1 May 2008 paragraph 4-1.1 4-1.1 Testing (AC Voltage Regulator, P/N 01-21501-1, for MEP-804A/MEP-804B). a. Shut down generator set. b...

That would be the LIBBY AC Voltage Regulator

I'd suggest performing the AC Voltage Regulator Test per the -24 TM. Be sure to use the correct test procedure. The 804's were built with two different AC Voltage Regulator systems. Libby & TRC. Different test procedures depending on which VR is in the set. You'll also want to verify someone...