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No part numbers? Any markings?

#12 is the wire terminals from the exciter. They go to item #10. So if the wires are on the block, easy to find and check.

Please, please, please remove this blue wire. If you were to start the set and it somehow made power, you would get to watch a major "Happening". This would mix AC power into a DC circuit.

Is the contactor getting any voltage at X1/X2, (The coil on the contactor?)

And you have tried to jump all the pressure switch? I would jump the whole pressure/safety circuit and see if it kicks in. If it kicks in, then you at least know where to start. One switch at a time.

I think there is a schematic on one of the doors. What gives the contactor the impulse to close the contactor?

I sure liked these things. Sturdy.

https://www.steelsoldiers.com/threads/m939-series-tms.218395/ this is the link for the M939 series trucks. Normally the -10 is the place to start looking.

After I die and become an unfettered being, I will be stopping in to visit Ken and Fuzzy's Motor Pools. You guys may have to put up with spooks in night!

Thank you!!

Tell us what TM's you are using. That way we make sure we are all on the same sheet of music. Did you get the TM's you are using from the forum here, or someplace else?

We are both right. The trailer and gen set are a PU set. But the MEP-804A is the problem. Most folks in the Forum are not familiar with the PU-802. Below are the schematics. In the norm, even if the A5 is dead, the initial excitation comes from the S1 switch. On start up, you do need to hold...

https://www.steelsoldiers.com/threads/all-the-tms-you-need-for-the-mep-326a-generator.204475/ look here.

I moved this thread to the right forum, "Parts wanted".

I have a PU 802 generator. Looking for the 2 wires off the voltage regulator to use to magnetism the exciter. The interrupter does not stay on when you hit the switch. The needle moves just a little when the master switch is turned to run for 2-3 seconds and the interrupter little goes out when...

You need to post a price for this sale, IAW the forum rules. Please do that, ASAP.

Thank you partner! good info!!

Have you downloaded the TM's for the truck in the TM Forum? The -10 manual should tell you where everything is stowed.

The connectors were on there. I put the color zip ties on before I removed the wires that were in tact. The ones that were rotted off I looked at the print line and found the "t" number printed on the black wires. NEVER, EVER, Trust someone else's work in the wire department. If someone else...

In case you dont have it.