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Old 11-17-2011, 07:49 PM   #1
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Wiring schematic for Onan emerald 1 circuit board

Hi guys, I am a new member and have a problem with my Onan generator out of 1974 Dodge c class motorhome. It runs well but does not have any ac voltage output. I had a minor fire on the circuit board and want to rebuild it. I know you can buy them but I have afriend who can repair it if I can find a schematic. The gen is emerald 1 series A 2 cylinder 4 cycle 4 KW. Model is 4.0 BGE 1P26100E. I have searched the internet but cannot find wiring diagram. I have the original books for the gen but they do not give schematic and cummins does not help. Maybe someone out there can help with this.

Thanks Peter

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Old 11-18-2011, 11:15 AM   #2
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Unit wiring diagram is shown on pdf page 21 of the installation manual: http://www.cumminsonan.com/www/pdf/manuals/965-0630.pdf Reasonbly decent schematic on pdf page 67.

Refer to pdf pages 65-71 (Section 7) of Service manual (http://www.cumminsonan.com/www/pdf/manuals/965-0530.pdf) for Control board operation and functions.

Dave in Virginia
1978 Winnebago Chieftain
Dodge M400 - 440-3
Classic Winnebago Site: http://www.classicwinnebagos.com/forum/index.php
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Old 11-18-2011, 12:21 PM   #3
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Workhorse Chassis Owner
Join Date: Apr 2010
Location: Western Montana
Posts: 324

Looks like Dave got the info you need
I have the original printed documentation
That genset is FAR superior to the "New" one installed in my 2009 RV
The new POC 4Kw has a splash oil system which means it does not even have a oil filter, single cylinder and junk fuel pump
Sure wish I kept the one you have
Please do not toss your defective Converters / Inverters / etc. in the trash
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Old 11-18-2011, 04:54 PM   #4
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Thanks again,
After much searching around and no real luck from Onan-Cummings or its dealers I was not able to come up with a schematic for the circuit board. I have the installation manual and service manuals but they do not show this; they do show the wiring of the gen. I took the circuit board to a friend who rebuilds circuit boards and he checked the rather simple board and found I had burned out one of the relays. He replaced the relay with a new one free and I was then able to put it back in the gen. The gen now puts out steady 110-120 volts and seems to work perfectly. This was a cheap easy fix so do not buy quickly as these boards can be fixed. I did find a company in USA called Colburn Electric who specializes in rebuilding boards and are reasonable. PHone--618-997-9015.

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onan, wiring

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