My Tractor Forum banner
  • Are you passionate about Tractors? Would you like to write about topics that interest you and get paid for it? Read all about it here!
1 - 14 of 14 Posts

·
Registered
Joined
·
37 Posts
Discussion Starter · #1 ·
I currently working on a pulling tractor and need some help on the wiring. Its an 18hp onan, some of the wiring is done for me. The coil has a small box attached to it (one wire to pos, one wire to neg, red and black.) And the condenser is attached already also. Any help finding a diagram would be greatly appreciated thanks.
 

·
Premium Member
Joined
·
2,207 Posts
cows
i think the SMALL box that you are referring to is the ignition module.
if this is so you have a P series engine ( electronic ignition)
can you post a few pics. of the engine?
thank you. boomer (the used onan engine parts guy )
 

·
Registered
Joined
·
37 Posts
Discussion Starter · #3 ·
Im pretty sure your right about the ignition module. I guess it could be a P series engine and some one bolted a BG MS shroud on it? Another question I now have is why would this engine have the ignition module and ignition points?
Do I just not wire the points in? And last question what does this round coil do, (the last pic.) Thanks for the help.

I hope these pictures work
 

Attachments

·
Registered
Joined
·
1,852 Posts
well I have never seen a "P" engine with points. I could be wrong, though. what are you going to put it on?
 

·
Registered
Joined
·
37 Posts
Discussion Starter · #6 ·
I bought it off a guy and he said it was from his friends john deere (im thinking 318?) it was partially disassembled like you see. He had gotten some more extra parts together for this engine because he wanted to hot rod it (extra cam, heads, valves, etc.) This engine will be going in my wheel horse pulling tractor im building.

Let me see if I can get some better pictures later.

Thanks
 

·
Registered
Joined
·
2,580 Posts
I think it is an engine from either a SS/18 or 18/6 TWIN Sears that someone put the later style intake and carb on. Looks like the engine was originally yellow under the black paint. That is the wrong crank output for a 318 Deere, they used the bigger output. That is the more standard 1-1/8" that was used by Sears and Wheel Horse.

Joe
 

·
Registered
Joined
·
37 Posts
Discussion Starter · #10 ·
Thanks everyone for the help so far. So if its basically a M series engine with P series intake and carb I should be looking for a M series wiring harness? And your right about the crank its 1-1/8''.
 

·
Sears/Craftsman Owner
Joined
·
803 Posts
The BG/MS is a hot rod already.It is 49.9 cubic inches.
 

·
Cranky Motorsports
Joined
·
15,199 Posts
click on the link in my signature that says "free manuals working again" I have manuals for an 18/6 an SS16 and the motor manuals for a b48M and a BF/MS motor

The most useful to you would be for the 18/6
 

·
Registered
Joined
·
37 Posts
Discussion Starter · #14 ·
Thanks a lot for the manuals, Im headed out right now to start on a harness.

Thanks again everyone. Hopefully I can get er fire up here this week.:thanku::thanku::thanku:
 
1 - 14 of 14 Posts
Top