Mep 803a No/Low Low Power Output

[Iron.Horse]

10 terminal block reads 12.2 on upper wires, not disconnected. Little tricky to get in there. A1 test, with wires disconnected is a crazy bizarre reading in the 60.0 range. I triple checked it and every time got a different reading, but it was definitely no lower than 50-60 ohms

 

[kloppk]

The resistance should be the same 12.2 at 10 Terminal block AND across the two wires behind the gauge panel.
Your 50-60 ohms indicates a poor connection between 10 and one or both of those wires.
I mentioned to check, inspect, clean the P4/J4 connector pins in post #12. Did you do that?

 

[Iron.Horse]

Here is a picture, I couldn't believe how high it is.

 

[Iron.Horse]

The resistance should be the same 12.2 at 10 Terminal block AND across the two wires behind the gauge panel.
Your 50-60 ohms indicates a poor connection between 10 and one or both of those wires.
I mentioned to check, inspect, clean the P4/J4 connector pins in post #12. Did you do that?

Yes sir, found J5, pulled it apart and sprayed it with electronics cleaner. I honestly have looked everywhere for P5 but haven't found it yet. I'll try to look again for it.

 

[kloppk]

Your DMM is actually displaying 76,300 ohms (7.6 KOhms)

P5 and J5 connect together.
J5 is bolted to the floor of the compartment behind the gauges. A small black connector with 4 wires..
P5 plugs into J5 behind the right access door.
P5 also has 4 wires.

Do you know how to decipher the -24 TM to figure exactly how it's wired from A1 to find 10?
The TM wiring method can be confusing to figure out...

edit:

Here is a quick drawing showing the actual wiring...

 

[Iron.Horse]

Your DMM is actually displaying 76,300 ohms (7.6 KOhms)

P5 and J5 connect together.
J5 is bolted to the floor of the compartment behind the gauges. A small black connector with 4 wires..
P5 plugs into J5 behind the right access door.
P5 also has 4 wires.

Do you know how to decipher the -24 TM to figure exactly how it's wired from A1 to find 10?
The TM wiring method can be confusing to figure out...

edit:

Here is a quick drawing showing the actual wiring...
View attachment 949149

I Really, Really appreciate the drawing and help... The tracing of wires makes a lot of sense, I pulled J5 again and sprayed it, traced the wires and looked for rubs and chews, they look fine. The original spade connectors were replaced with permanent crimps, wires seem solid. I guess I could cut them out and re-splice for good measure? Wires seem fine going into gen head, no rubs, but I can't see where the one set terminates on the... coil? Only the other set on number 10.

Should I cut out the larger wire that lays on the gen head and replace from the plug to where it enters the head? That would eliminate a few feet of wire that could have internal damage?