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I'm honestly not that great with these. I've either just ended up not figuring them out or they're good. Maybe someone else will chime in with more help. I'm sorry!

Someone put a different injection pump into the one that is different. Yanmar has different part numbers for the different injections pumps, depending on what side the fuel comes in.

It's an odd, angry, and loud fella. I didn't know that was there solution, I came up with that on my own. Guess it's just common sense.

I wanted to revive this old thread in case anyone is still watching. I kept some of the parts when I parted this out. One of the was the potentiometer for the voltage adjustment. I grabbed it from my parts bin to use on something & went to use it with no luck. Tested it, and it was dead...

It's not to late, reach out to me via PM. Sorry on the late response. I was away on a road trip.

Turns out, you just keep tapping on the housing and it will come off from the adapter plate bolted to the motor. The stator made ever so slight contact at some point... probably why it wasn't making power. I didn't take pictures at the time but if I didn't already get rid of it, I will edit the...

I'm taking this thing apart today and am a bit stumped on how to take the generator off. TM is useless. Work Package just says "Remove from Engine" Uhhh, okay. They will write 3 pages on how to change a hose clamp, but not elaberate on how to do this. So government!

I pulled the control panel and alternator cover off to have a look inside. It all looks neat and in order but someone was in there. Some of the caps to the brushes seemed loose to I tightened and tested again... less than 1 volt now with the breaker not tripping. It must be toast. I guess it...

The TM has you do it first exactly as I have it pictured. If it is not within range, then remove everything to confirm... but, it seems that if you remove it that you will more than likely get the same reading, and it is just removed so it's ready to be replaced. Unless you find something like a...

Well, this may end up being a short fix-up thread. Went through the alternator testing procedure as per the TM via P1, E & F. Resistance should be 13-16 ohm. I got 37.6... way off. I know temperature can effect this and it drift a bit, but not that much. Also tested the stator via P1, started...

I have actually seen his videos and watch them in the past for other things. Unfortunately, I don't think his will be helpful on these units because they're unique to the MEP 531A. I think I have a bad alternator or voltage regulator at this point. Funny, I saw where you are from... I grew up...

I put a new diode in just in case, I had a bunch. Send me a PM with your address.

If I don't get this unit to make power, I'll just part it out and use the motor on something else. That was my backup plan. Hopefully you get yours going!

Howdy all, Been a while since I started one of these! Got myself a MEP 531A at auction. Definitely had a bunch of hands in it, but, I got one of the best deals that was had in a while on one. I knew right away the breaker was pushed into the panel and the cover over the gauges was...