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I have an early 70's Detroit 453N engine with a bad head. I have a good head on an identical engine but it has N45 fuel injectors where as the old original head has N50 fuel injectors. Can I just use the new head with the N45's or should I put the N50's from the old head in the replacement head...

Yes, with Guyfang's help I did. It ended up being a shorted out diode.

Well, just an update. It turned out to be a bad diode. Put a new set of diodes in, tested the old ones and sure enough one was bad. Its back to producing power just fine now. Guyfang I want to thank you for helping me with this. I would never have figured this out without your help. Thanks again.

Well I couldn't find a 24 volt dc transformer locally so I took my 18 volt cordless drill battery and fed that into the 110 volt receptacle and started the engine. Still nothing. So I guess that means I'm going into the end bell. Unless I find something obviously wrong there should I replace the...

Ok, I will look at those things today. Funny you should mention the flashlight batteries. I was already going to ask you about an idea I had. If I took a 24volt dc transformer and fed the 24 volts into the 110 volt outlet and then started the unit would that lite off the gen? My thinking is if...

Yes, I have 24 volts dc at F1 and F2. I followed the directions in TM 5-6115-465-34 page 5-75. When I hold the start switch up I notice the voltage meter will climb up to about the 24 volt range until I release the switch. Anyway, after following the instructions in TM 5-6115-465-34 page 5-75...

Update. Well I went and bought another speed switch. This one is the exact same model right down to the same serial #, which I thought was odd. It's a used switch but looks almost new. I know that doesn't necessarily mean anything but its not only clean but still pretty shinny. Doesn't look like...

Yes, the new switch has that number. I have attached a few more photos. The vendor has agreed to let me return the switch. So whether it is the wrong switch or defective I may as well do that and start looking for another switch.

The old switch is a Sunchro-Start model Go-3Ma Part # SA-1644 and I think it is nsn 5930010219378 and I believe TM 5-6115-458-34 and TM-07536A-35, DoD drawing # 70-4058. I also found on the trouble shooting schematic on the generator... Speed Switch- S9-1 Start disconnect and field flash, S9-2...

Well the latest is that I bought a new speed switch and installed it, but the generator is still not producing power. Not only that but with the new speed switch the engine will not shut off. I had to disconnect the plug to the speed switch to kill the engine. Shouldn't a new speed switch be...

I just took the cannon plug off the speed switch and used my vom on the speed switch pins and determined that I had continuity across pins a&b and g&h but no continuity across pins a&c, d&e or f&j. I took the speed switch apart and the three switches in there do not appear at least to be...

Ok, I did all that and have found out a few things. I jumped across pins A & C on the speed switch J37 plug and found I do have 24 volts across F1 & F2 coming out of the exciter box. According to the TM that indicates the problem is probably the speed switch. I did the continuity and...

Ok, now your talking a language I understand. I know a thing or two about beer cans. I believe I found the beer can ah....I mean speed switch you are referring two. The breaker on top did not appear to be tripped. I pushed it down anyway and started the generator but still nothing. Could you...

Ok, I checked for dc voltage at the 110 outlet like you said and there is none at all when holding up the start switch. I am not sure what the speed switch is? Is the schematic you are referring to on the generator or in a TM? Thanks for your help.

My Mep005 generator has stopped producing power. Only has 80 hours on it. after it quit I did get it to pick up one more time by holding the start switch longer. But now it won't pick up and produce no matter how long I hold the start switch. Any idea what I need to do or replace?

Even when I hold the start for about a full minute it still won't start charging. Seems like that would be plenty of time wouldn't it? I will see if I can find anything in the TM's. Thanks for the help.

Purchased a Mep005A with very low hours and did the single phase split phase conversion on it. It produced power just fine both before the conversion and after. I start it about once a month just to keep everything working. I started it up last week and it would not produce any power. After...

Thanks Ray, that thread gives me a couple things to check today.

Purchased a Mep005A generator that only has 45 hours on it but has obviously not been ran in many years. Had to clean the fuel tank out, replace the primary fuel pump and clean the strainer basket in the other one. Had to clean the fuel filter cans and install new filters. I now have clean fuel...

I hope I am in the right section for this question. I am salvaging the wreaker bed off of a scrapped 1984 M936 on to another truck. Everything is pretty straight forward except for one thing. The truck I am puting the bed onto does not have a front winch and thus does not have the secondary...