Mep 803 with problems shutting down

[Triton]

Well I looked at the relay when starting the unit, the crank disconnect and flash relay activate. When I disconnect the fuel solenoid to shut the unit off the crank disconnect open when the motor comes to a full stop. That was the only relay I could see operating. I also checked the 137n wire disconnected with the unit running, it has 24volts on the wire so something is back feeding it. I'll trying to read the schematic to see where 137n goes.

 

[DieselAddict]

Can you please read the voltage at pin "N" in the diagnostic port with the engine running and S1 in the "OFF" position?

Can you please read the voltage at pin "K" in the diagnostic port with the engine running and S1 in the "OFF" position?

Measure from pins to ground.

 

[Triton]

Pin N reads 0 volts engine running and S1 in the "OFF" position
Pin K reads 24volts engine running and S1 in the "OFF" position
Used pin B as ground

 

[DieselAddict]

Ok. Great. We have eliminated the starter solenoid as the problem.

If you have 24v at K with the switch off we need to track that down. Both should be 0.

 

[DieselAddict]

Please read the voltage at pin "R" in the diagnostic port with the engine running and S1 in the "OFF" position?

 

[Triton]

For some reason my diagnostic port document doesn't have pin K

 

[DieselAddict]

As in there is no pin in there or you don't have a diagram that shows pin K?

 

[Triton]

My diagram didn't show pin K or R, (strange)

Pin R reads 24volts engine running and S1 in the "OFF" position

 

[DieselAddict]

See if this helps.

 

[Triton]

I have that pic but the legend didn't have those pin letters

 

[DieselAddict]

If you have some alligator clip wire jumpers I would recommend that you shut the engine down and remove the wires from terminal 3 on S1. Put the wires together on one end of the clip and clip the other end to terminal 3 on S1. Tape up that end so it stays together and doesn't short against anything.

Start the unit then move S1 to off. Remove the clip from terminal 3 of S1. Does the engine stop?

 

[Triton]

This is what I was working off of.

 

[DieselAddict]

Download this one from the tech manual section and check out page 107.

http://www.steelsoldiers.com/attachment.php?attachmentid=601961&d=1451935825

 

[Triton]

Ok I just tried that and it did not shut down, it's kind of strange that without the wire connected to the starter solenoid the fuel solenoid shuts off fine.

 

[DieselAddict]

Another question, all the gauges continue to read correct values when S1 is off and the engine is running?

 

[Triton]

All gauges are working except the voltage gauge (that works intermittent) the battery gauge works and charges and there are no fault lights

 

[Triton]

Sorry I miss read your question, yes all the gauges are still working when S-1 is off

 

[DieselAddict]

OK. Have you tried pulling CB1 out with S1 off and the engine running?

 

[Triton]

Haven't tried that yet, may have to do that tomorrow running out of time. Thanks for your help!

 

[DieselAddict]

You're welcome. We will get this figured out.

I also think we need to revisit the first set of reading now that you have the correct pin-out of the diagnostic port. I still think the problem is with the starter solenoid.