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Old 08-15-2019, 12:45 PM   #1
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No 12V to J2 pin2 on EMS

I have a 2002 Monaco Windsor and my EMS is not sensing the generator so its showing 30amp on the display instead of Gen Set and i can't run both A/c units. When hooked to shore power it senses 50amp and everything works. I need to know where the blue wire goes once it goes into the wall so I can find out what the problem is. If someone knows of a common bad spot in the wiring or where it leads to a fuse or breaker I could sure use some help. Thanks, Scott
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Old 08-15-2019, 01:59 PM   #2
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Can't help with location but I would unplug, clean and plug back in the generator control harness, down by the generator.
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Old 08-16-2019, 06:07 AM   #3
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Quote:
Originally Posted by twinboat View Post
Can't help with location but I would unplug, clean and plug back in the generator control harness, down by the generator.
Will do! Thanks
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Old 08-16-2019, 07:22 AM   #4
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The EMS system has to sense that the generator is running.

I have not confirmed but I 've read that it picks up a 12 volt signal from the generator start switch located in the bedroom. You may check there, not sure of your floor plan but my gen start button is mounted under the small wardrobe cabinet next to the bed, the floor of the cabinet pops up to access the wiring.

On my wiring diagram it does show a wire coming from the generator hour meter to the EMS so that's another place to check.


You may also try to call M&M Electronics, they still service the Intellitec EMS and may have knowledge of where Monaco got the 12 volt signal from
https://www.mmrvelectronics.com/
they helped me when my system failed after a lightening strike.


If that doesn't work you may have to get a fox and hound to trace the wire.
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Old 08-16-2019, 11:32 AM   #5
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I believe your correct. I pulled the gen switch in the bedroom and a blue wire runs to it. That switch is completely dead so I have to find the break. I haven’t had a chance to clean the connector at the generator yet but thats my next move. Thank you!
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Old 08-16-2019, 06:43 PM   #6
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Well, at least you found the source of the problem but now have to find the rest of the wiring.
I also have a generator start switch on the center dash under the radio, I wonder if they are daisy chained?
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Old 08-16-2019, 10:34 PM   #7
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I don’t know. I haven’t had a chance to clean the connector yet but I will in the morning.
Iirc and I will verify in the morning but my bedroom gen switch didn’t light up when I used the jumper on J2 of the board so I’m thinking the problem may be a ground? If it was the 12v+ side wouldn’t the light come on for the bedroom switch when power was fed back through the jumper? I’m not savvy on electrical stuff so I don’t know. Thoughts?
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Old Yesterday, 06:34 AM   #8
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I checked the plug at the generator and it is making good contact.

With the generator running and the jumper in place there is still no power to the generator switch under the cabinet in the bedroom but there is ground so I think there is a separate blue wire running to the EMS not connected the closest generator switch which is under the cabinet.

I am out of ideas at this point....
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Old Yesterday, 07:25 AM   #9
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Do you have a wiring diagram for your coach???
On mine, page 26 shows that an 18 ga blue wire comes from the generator hour meter to the EMS. Seems odd that they'd run a separate wire that far for this but nothing would surprise me.


Only other suggestion I'd make is to get a Fox & Hound wire tracer, you should be able to find where the wires go.
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Old Yesterday, 10:26 PM   #10
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Thanks Jim I bought a Fox and Hound and traced it to a relay in the Power shutoff bay and I'm trying to figure out how he relay is powered now. You,ve been a big help. I'll work on it more later today.
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