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Mine has 4 wires two of them have terminals that only fit on the larger post, the other two are small and may have been swapped

I haven't checked it in so long I forget, I'll check the wiring in the am. I don't know how you figured that out but it's been good for me to better learn the unit. Would that keep the unit from putting out power?

That worked it shut down!! Thanks for the help! What does that mean bad alternator?

Same thing still running!

Ok unit running, turned off S-1, pulled K-16, still running!

How can I check that? Where is it located?

Ok my trailer is a ltt-hc trailer

Pin R on the J3 diagnostics canon plug is hot with the S-1 turned off when the engine is running, when I pull the fuel solenoid to shut off the motor it goes to 0 volts. I checked the wires on both sides of TB6-4, they are correct, 137-N, 137-F on one side and 137-A and 137-U on the other...

Guyfang, earlier in the post you mentioned M5 being wired wrong, should I check M-5 the Fuel Level Indicator for proper wiring?

Disconnected A-2 this am, guess what? Still didn't shut down, but that answers the question about A-2. Getting a little closer!

That was just a picture that I found of the grounding rod kit, I would like to purchase those items. Here is a picture of the trailer I have , I was just wondering about what was stored in the box, I noticed the non flammable gas sticker on the box but mine didn't have anything in it when I...

Does anyone know what items where put in the tool box for a Mep 803 trailer? Also where could I find the grounding rod items in this picture?

I rechecked tonight Pin N and no voltage with the switch in off position, Pin K and Pin R have 24 volts in off position. I rechecked and activated CB1 in the off position and it didn't shut off the system. Thanks for the correct pin out document, I enlarged that so I could read a lot easier.

I was able to check CB1 before going to work this am, I started the unit and turned S-1 to off then pulled CB1, it didn't turn off. I did try starting the unit with CB-1 pulled out and it would not start.

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

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

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

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.

This is what I was working off of.

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