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So, what to do next in this case? The test pointed basically to a bad A11 Exciter / Voltage Regulator which needs to be bench tested and repaired This is the connections you have to make indicated by "Test" and a "number" which you can find in the pdf, which is extracted from -34 manual...

@Gordy1ID Sooooop as of right now when I start it, I have power 24vdc to my d-pin and my c-pin on my a11 unit. So I think that's normal. No My a5-2 terminal does have power now which turns on my A5. Correct? No A 5-13 also has 24 volts when starting which means I have a good S9 switch...

Gordy, One question for clarification, did you check D Pin for continuity to ground when you started the Genset meaning during excitation or when the Genset was stopped or after releasing the start run stop switch from start to run?

Gordy, check that Special Relay Box has continuity to chassis ground first, then between A5-15 Terminal and the ground stud in Special Relay Box for continuity. If you have continuity, then check continuity from A5-2 to P9D (plug which mates with/to J9 Receptacle on A11), if you have continuity...

This should put this question to rest.......................

The wiring diagram in the -12 and /or -34 I had posted in post #26 are correct and they show connection to Chassis Ground from A5-15 That part is cutoff in my picture. It would be a good idea if people with questions about their Generators could let us know on how proficient they are correctly...

Well, then @Guyfang may have gotten it mixed up. Can happen to all of us.

@Gordy1ID This is the test procedure for a A11 unit, including excitation Here you can see that 24V from A5 come in on PIN J9C and GND on PIN J9D which connect the exciter coil to J9R (GND) and J9S (24V)

@Gordy1ID the D Pin is switched to chassis ground through A5 That’s what I have been trying to explain to you. The C pin has the 24V switched through A5 Both pins C and D are switched through A5 when the S9 switch starts the excitation simultaneously. I am not sure on how you came up with the...

@Gordy1ID, 24V is only coming out of PIN C on J9 PIN D is the chassis ground Follow J9C via P9C to the left of A11 in the wiring diagram and you will wind up on CB1 via another Normal Open set of contacts on K5 and a resistor R 35 the relay you show in your picture is a DIN compliant relay...

For the interested reader: Bosch started to use a numbering system in Automobile 12V circuits beginning in 1948/49 when they changed to 12V from 6V systems in cars. This became then the German Norm I think by 1951/52 which all German Automotive Manufacturer and OEM’s followed: @Gordy1ID...

Oshkosh sells this retro kit https://www.oshkoshequipment.com/products/detail/111/439/Voltage%2DRegulator%2DKit%2DSolid%2DState%2DReplacement%2DKit and they published the wiring diagram under the more info tab all the way on the bottom of page under heading files...

I would step back, take a deep breath and then look at the DC Wiring Diagram You removed J9 D and are trying to get 24V, but if you follow above diagram then you will see that J9 D connects to P9 D and becomes wire D12B which goes to A5-2 and on A5 through a Normally open contact of K5 (which is...