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Onan Generators

Onan BF Will Not Crank


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  #11  
Old 11-07-2017, 04:20:32 PM
nothingbutdarts nothingbutdarts is offline
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Default Re: BF Onan will not crank

OK so this is a post on this unit then.

https://www.smokstak.com/forum/showthread.php?t=159500

So again, could you answer ALL the questions in my last post????
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  #12  
Old 11-07-2017, 04:44:39 PM
signmakerdoc signmakerdoc is offline
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Default Re: BF Onan will not crank

Serial #B773 235450

Yes, this IS my post

When I got this genset, it hadn't run in abut 5 or 6 years, came out of an rv, Paid $50. fuses are goo, there is 12v to the coil
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Old 11-07-2017, 05:16:07 PM
nothingbutdarts nothingbutdarts is offline
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Default Re: BF Onan will not crank

Any chance you could post a picture of the inside of the control box????
I can't remember how many terminals there are on the start solenoid inside the control box.
If you have a GOOD set of jumper cables, can you jump one end of the start solenoid on the big 5/16" lug to the other big lug and see if the engine will try to turn over? It draws a lot of amps. to turn the engine over!!!
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Old 11-07-2017, 05:22:12 PM
JT240Z JT240Z is offline
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Default Re: BF Onan will not crank

Quote:
Originally Posted by signmakerdoc View Post
Been working on it from time to time sine I purchased it over a year ago. In one of my earliest posts, I had the problem of it starting, running for a couple minutes, then shutting down, so the replacement of these parts was an effort to correct the earlier problem
So, if you could start it in the past, I would look at something you've done since then.
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  #15  
Old 11-13-2017, 11:14:46 AM
signmakerdoc signmakerdoc is offline
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Default Re: BF Onan will not crank

Found another problem, I wanted to make sure everything in the control wiring was good, so I connected the battery, and it started smoking out of the control box, so I took it off, the only melted wires were to the relay, replaced the wires. So was wondering if it was a matter of a short, so I laid the cover on a piece of plastic, hooked up the battery, no short, no fried wires??????????????????????????????????
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  #16  
Old 11-13-2017, 09:29:34 PM
Imaybail Imaybail is offline
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Default Re: BF Onan will not crank

The control box needs to be grounded for the starter relay to work. The relay is just a standard Bosch type relay. Onan relay is four poles labeled 1,2,3 & 4. These correspond to 85, 30, 86, & 87 on the Bosch relay.
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  #17  
Old 11-14-2017, 10:22:49 AM
signmakerdoc signmakerdoc is offline
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Default Re: BF Onan will not crank

I believe I may have found the problem, upon further investigation I found the spacer grommet for the rectifier was bad, so I just put the rectifier in a shrink tube, put the control back in place, no more short, now on to further testing. Thank you again for the help
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  #18  
Old 11-14-2017, 03:34:33 PM
signmakerdoc signmakerdoc is offline
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Default Re: BF Onan will not crank

can someone tell me the proper spark plug to be using in this genset
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  #19  
Old 11-14-2017, 03:49:17 PM
JT240Z JT240Z is offline
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Default Re: BF Onan will not crank

Quote:
Originally Posted by signmakerdoc View Post
can someone tell me the proper spark plug to be using in this genset
Champion old # H8C New # CHA 587 according to the manual. Pray tell, may I ask what that would have to do with the beast not cranking?

Last edited by JT240Z; 11-14-2017 at 04:04:01 PM.
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  #20  
Old 11-15-2017, 01:08:44 PM
signmakerdoc signmakerdoc is offline
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Default Re: BF Onan will not crank

Cranking problem has been resolved, tuning it up before I do any further testing, unit had not been used for at least 5 years, came out of an early 70's RV
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