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I dont think so. If you have an A11 that works right, try it in your problem gen set. Every time you put another A11, or Vr in the set, you have different problems.

I changed the VR in the A11 and when I started the unit up the freq and voltage gage went full dial then to nothing, (This tells me that the S9 is sending inital excitation to the Main gen. Thats good. The volts/hertz drops off because the A11/VR is not taking over.) I put the original VR back...

What voltage do you MEASURE, with a DMM at the load terminals when its running?

OK, What idiot light comes on when you turn on the S7 to keep it running?

Did you do what I wrote in post #16?

Volt reg card is bad, in the A11.

Put a known good A11 into the generator that will not make voltage, all the time. Fire it up. What happens? Notice, while starting, do the AC volt and hertz meter come up a ways, and drop down again? Or do they not move at all? If they move, then you are getting initial excitation. That means...

F1 and F2 are on the left side, inside the rear door. There is a terminal strip there TB16. Should only be 4 wires to it. Two in, two out to the main gen.

If the Presice set is a MEP-105A, NSN 6115-00-118-1252, then yes it will.

When you put the A11's in, you don't even need to bolt them in. Just slide em in. They are grounded through the wire harness. Make testing faster.

Do what Ray suggested first. PROVE the A11's are good, on a set you know works.

Ray wrote: Have you tried swapping one of the exciters back into the previously "Good" generator to verify that both exciters are in fact bad? Perhaps something else is going on with the one exciters into and the exciters are not really the problem? After trying both exciters in the gen set you...