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I could swear that I had but I can't find it now so I guess I didn't. I have now. Thanks for the help so far!

Hi all, I am looking for a working Diesel Engine Governor for my MEP-804A. It was originally fitted with a Woodward 8270-1002 but the following parts should be compatible 8270-1002, 88-22850-15, 10502-001-0-24, 88-21860, 82701002, 703796AT Condition new or used as long as it works.

On my machine the GCU is A5. A6 is the fuel solenoid. I'm assuming you are referring to the GCU. It was a used unit listed on the auction side as "Good. Working condition" but after further messaging with the seller it was clarified that it was not actually tested so it is also now an unknown...

On the old GCU A6 was 0v at both ends. On the new GCU I haven't bothered to measure because it won't even turn over.

This is true. I have been unable to find a schematic for the GCU so all that was left is following traces and testing components. Everything that we (my brother is a radar EET and has been helping) could test and measure checked out. Without schematics to actually know what everything should be...

Well, that went poorly. 1. I reinstalled my original GCU after replacing all of the major components. Exactly the same behavior. 2. To assure myself that the engine would start I connected a variable DC power supply to the throttle solenoid and was able to get the engine to start and run, I...

We did talk. He was very helpful. I ended up deciding to do what he did and just replace all the chips in the top-corner. I'm actually installing it today to find out if that worked.

So far I've been unable to find a replacement part. Based on what @kloppk said above and a lot of pictures online it seems like the output FETs burn up often. I've replaced those but I'm still not getting output. @kloppk When you fixed the one was there anything wrong other than the FETs...

Several days with no reply from mac/mc so I don't know if he's traveling or what. Does anybody else have a source for a replacement Woodward 8270-1002 Governor Module? @kloppk maybe?

I pulled the governor module today. No signs anywhere of any damage or burned components. The conformal coating has obviously been messed with by somebody before me but no signs of damage anywhere. I'm just waiting on a reply from mc/mac now to buy a replacement.

Thank you both for you inputs! I definitely got a result. 1st I fixed the wires on the switch. Only one was in the wrong place and everything acts normal again so that was easy. 2nd I checked all the things ya'll suggested from @kloppk 1) 24 volts DC power across terminals 3 & 4 ===>...

I finally found the wire numbers tonight. They are in "Figure 8. Control Box Harness Assembly" of TM-9-6115-643-24P. Posting here in case it's every helpful for anyone else. The Master Switch (aka Start Switch) is known as S1 in the schematics. Terminals 2-4-6-8 are all jumpered together on...

I have a similar but different starting problem from the other 804A start problem threads. I've read everything in those threads and I think I've done all of those tests (details below) so I "guess" I'm down to the governor module being the problem but I want to be sure first before just...