Generators and Motors
[Home] - [HELP] - [Forums] - [Library] - [Photo Gallery] - [Groups] - [Classified Ads] - [Subscribe] - [Links] - [Books] - [Sponsors] -

Go Back   SmokStak > SmokStak® Vintage Electrical Equipment > Generators & Electric Motors General Discussion > Onan Generators
Forgot Password? Join Us!

Notices

Onan Generators Restoring, operating and maintaining vintage Onan generators.

Onan Generators

Onan 7.5JB - Wiring


this thread has 75 replies and has been viewed 2641 times

Reply
 
Thread Tools Display Modes
  #1  
Old 01-07-2017, 05:13:55 PM
kiteoregon kiteoregon is offline
Registered
 
Join Date: Jan 2017
Location: Portland, Oregon
Posts: 30
Thanks: 7
Thanked 2 Times in 1 Post
Default Onan 7.5JB - Wiring

So the PO on this unit tried to label the lines, but the labels are since gone. Some of the wires are tied together, here are the pairs:

L1 = T1 & T6
L2 = T8 & T10

Then T9 & T11 are tied together as well as T3 &T5

I want to wire to a 220 circuit.

So, which of the T9 or T3 pair would be equivalent to the common? For the ground i assume i would just connect the ground to the ground post in the electrical box.

Thanks
KO
Reply With Quote
Sponsored Links
  #2  
Old 01-07-2017, 06:02:07 PM
Max Thompson Max Thompson is offline
Sponsor
 
Join Date: May 2009
Location: N.W. Missouri, USA
Posts: 5,956
Thanks: 5,251
Thanked 5,646 Times in 3,017 Posts
Default Re: Onan 7.5JB - Wiring

900-0814 is the Yd gen-end manual you want. It has "re-connection" diagrams in it and an explanation about the neutral connection. This manual can be downloaded from the below linked site, thanks to Doug & Mike's hard work.

I assume this is the same JB you just had a fight with the points on, but without posting the model & serial numbers again we have to go back to your old thread to see if we can find that info. The data plate info will also let us find the build sheet & wiring diagram for your specific set.


http://www.twinslan.net/~n0nas/manuals/onan/
Reply With Quote
The Following 3 Users Say Thank You to Max Thompson For This Post:
  #3  
Old 01-07-2017, 06:39:36 PM
kiteoregon kiteoregon is offline
Registered
 
Join Date: Jan 2017
Location: Portland, Oregon
Posts: 30
Thanks: 7
Thanked 2 Times in 1 Post
Default Re: Onan 7.5JB - Wiring

I will look this up...

7.5 Jb - Serial: A960597423 Spec: 68774E.

I could not find the one you referenced, is this the correct one: 0900-0186 Onan Mobile, RV & AUX Genset Wiring Diagrams (06-1989).pdf
Reply With Quote
  #4  
Old 01-07-2017, 07:50:43 PM
Max Thompson Max Thompson is offline
Sponsor
 
Join Date: May 2009
Location: N.W. Missouri, USA
Posts: 5,956
Thanks: 5,251
Thanked 5,646 Times in 3,017 Posts
Default Re: Onan 7.5JB - Wiring

Sorry, should have read #900-0184 . I will look up your build sheet & print.


Your print should be attached, it includes reconnection diagrams. Did not find the build sheet, maybe Kevin or MBB can locate it.
Attached Files
File Type: pdf 7.5 JB DIAGRAM 612-6650.pdf (149.4 KB, 52 views)

Last edited by Max Thompson; 01-07-2017 at 08:06:05 PM.
Reply With Quote
The Following 2 Users Say Thank You to Max Thompson For This Post:
  #5  
Old 01-07-2017, 09:13:15 PM
kiteoregon kiteoregon is offline
Registered
 
Join Date: Jan 2017
Location: Portland, Oregon
Posts: 30
Thanks: 7
Thanked 2 Times in 1 Post
Default Re: Onan 7.5JB - Wiring

So now how do i read this schematic? This is to be wired into a DPDT breaker, so 1 phase, 220, 60 Hz. But from this i am not sure how to figure out what T wires are tied together to create a hot leg?

L0 = T2, T7, T4, T12, these are all connected to the post in the wiring box, this should be my common. Should i connect the ground to the common, or to the ground post on the back of the generator that the battery uses?
Reply With Quote
  #6  
Old 01-07-2017, 09:42:36 PM
MBB MBB is offline
Registered-III
 
Join Date: Apr 2009
Location: Elk Grove Village IL USA
Posts: 3,310
Thanks: 1,437
Thanked 2,856 Times in 1,447 Posts
Default Re: Onan 7.5JB - Wiring

Here is the build sheet. I cant read the AC wiring diagram number.

Here is the heater diagram.
Attached Files
File Type: pdf 75JB68774E.pdf (30.1 KB, 32 views)
File Type: pdf 612-6642.pdf (158.6 KB, 22 views)
File Type: pdf 625-0023.pdf (36.5 KB, 30 views)
Reply With Quote
The Following 4 Users Say Thank You to MBB For This Post:
  #7  
Old 01-07-2017, 10:18:37 PM
Billy J Shafer's Avatar
Billy J Shafer Billy J Shafer is offline
Subscriber
 
Join Date: Nov 2004
Location: Centerville, Texas
Posts: 17,159
Thanks: 8,885
Thanked 14,501 Times in 6,845 Posts
Default Re: Onan 7.5JB - Wiring

It is wired for 120/240 single phase
2-4-7-12 is the common
The ground can go anywhere.
__________________
I don't talk to myself. This early in the morning. Why the hell should I talk to you.
Reply With Quote
The Following 3 Users Say Thank You to Billy J Shafer For This Post:
  #8  
Old 01-08-2017, 10:54:17 AM
MBB MBB is offline
Registered-III
 
Join Date: Apr 2009
Location: Elk Grove Village IL USA
Posts: 3,310
Thanks: 1,437
Thanked 2,856 Times in 1,447 Posts
Default Re: Onan 7.5JB - Wiring

It looks like I didnt include the complete control wiring diagram. Here are all 3 pages.
Attached Files
File Type: pdf 612-6642-1.pdf (216.1 KB, 32 views)
File Type: pdf 612-6642-2.pdf (226.7 KB, 25 views)
File Type: pdf 612-6642-3.pdf (158.6 KB, 23 views)
Reply With Quote
  #9  
Old 01-08-2017, 11:56:29 AM
Jim McIntyre's Avatar
Jim McIntyre Jim McIntyre is offline
Subscriber
 
Join Date: Nov 2004
Location: Mooresville, Indiana, USA
Posts: 4,107
Thanks: 709
Thanked 2,270 Times in 1,313 Posts
Default Re: Onan 7.5JB - Wiring

Quote:
Originally Posted by kiteoregon View Post
So now how do i read this schematic? This is to be wired into a DPDT breaker, so 1 phase, 220, 60 Hz. But from this i am not sure how to figure out what T wires are tied together to create a hot leg?

L0 = T2, T7, T4, T12, these are all connected to the post in the wiring box, this should be my common. Should i connect the ground to the common, or to the ground post on the back of the generator that the battery uses?
IF you are using this to tie to a building's power system, the T2, T7, T4, T12 is NOT ground. It is neutral.
Reply With Quote
  #10  
Old 01-08-2017, 12:09:42 PM
Billy J Shafer's Avatar
Billy J Shafer Billy J Shafer is offline
Subscriber
 
Join Date: Nov 2004
Location: Centerville, Texas
Posts: 17,159
Thanks: 8,885
Thanked 14,501 Times in 6,845 Posts
Default Re: Onan 7.5JB - Wiring

Yes ground and neutral are two different items.
__________________
I don't talk to myself. This early in the morning. Why the hell should I talk to you.
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

F o r u m Jump

Similar Threads Chosen at Random
Thread Thread Starter F o r u m Replies Last Post
Onan 5.0 CCK wiring help Handyhiker1 Onan Generators 16 08-26-2015 07:12:49 AM
Onan wiring help on 2.5 AJ PecosPhil Onan Generators 5 07-29-2013 10:05:45 PM
Onan 4.0 Gen set wiring help Bwill Onan Generators 5 08-13-2011 07:41:25 PM
Hot Wiring a 4 CCK Onan c east Onan Generators 3 04-11-2011 08:17:58 PM
Onan CCK wiring sam c Onan Generators 2 06-23-2008 01:33:06 PM


Use "Ctrl" mouse wheel to change screen size.
All times are GMT -4. The time now is 10:15:49 PM.

Smokstak and Enginads site search!


All use is subject to our TERMS OF SERVICE
SMOKSTAK® is a Registered Trade Mark - A Community of Antique Engine Enthusiasts
Copyright © 2000 - 2016 by Harry Matthews P.O. Box 5612 - Sarasota, FL 34277