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?

 

[kloppk]

Don't cut any wires yet. You need to do some more measurements to isolate where the problem really is.

Based on your reported measurements there is an issue with voltage making it from A1 to the two Find 10 terminals.
What needs to be done are some continuity measurements on the wiring between the two.
All continuity measurements below would be a resistance reading of about 0 ohms.
Disconnect P5
1) Check for continuity from one of the Find 10 terminals to P5 pin 1 or P5 Pin 2. One or the other is connected to P5-1.
2) Check for continuity from the other Find 10 terminals to P5 pin 1 or P5 Pin 2. One or the other is connected to P5-2.
If you find "continuity" for the two wires in steps 1 & 2 above, then proceed to step 3.
3) Check for continuity from J5-1 to Terminal Block 5 terminal 17.
4) Check for continuity from Terminal Block 5 terminal 17 to the wire that goes to A1 terminal 6.
5) Check for continuity from J5-2 to Terminal Block 5 terminal 18.
6) Check for continuity from Terminal Block 5 terminal 18 to the wire that goes to A1 terminal 5.

Post up your findings and we'll go from there.