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Onan Start Relay - One Size Fits All


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  #1  
Old 02-20-2015, 06:25:54 AM
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Lightbulb Onan Start Relay - One Size Fits All

Yes, a Ford relay WILL work on an Onan... if that Ford relay is a Ford Part Number SW220 or an AMC Part Number 3227812 or a Chrysler Part Number CH 2336 or a Delco Part Number 1114206

The SW220 has an isolated coil, meaning that the relay's pull-in coil is not internally connected, so it can be used on any Onan, regardless of how the OEM relay is internally wired, because the coil in the SW220 terminates at the relay's two smaller terminals, and is not internally connected to either of the larger switched terminals.

Connect one small coil terminal to the relay's large terminal that's connected to battery +, and the relay will close when the other small coil terminal is grounded to start.

Ground one of the small coil terminals with a jumper under a mounting bracket bolt and the relay will close when the opposite small coil terminal is connected to battery + to start.
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Old 02-20-2015, 09:06:05 AM
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Default Re: Onan Start Relay - One Size Fits All -

Good work. How did you come up with those numbers that's great news ?
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Old 02-20-2015, 11:26:36 AM
yellowlister yellowlister is offline
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Default Re: Onan Start Relay - One Size Fits All -

That's cool. I found them for 13.99 to 28 bucks. Onan solenoids are about 25 to 35 shipped. Good info if your in a pinch and don't have a spare

Last edited by yellowlister; 02-20-2015 at 10:26:56 PM.
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Old 02-20-2015, 11:35:12 AM
Jack Hottel Jack Hottel is offline
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Default Re: Onan Start Relay - One Size Fits All -

I beg to differ . Onan PN 307-0845 connot be replaced with a 4 terminal device. The I terminal is needed as an isolated source of 12V. Here is a link.
Jack Hottel
http://www.smokstak.com/forum/showth...d+for+307-0845
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Old 02-20-2015, 11:41:20 AM
Lloyd H Lloyd H is offline
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Default Re: Onan Start Relay - One Size Fits All -

Jeep used a ford type solenoid that had an isolated coil plus an "I" terminal as well. 5 terminals total
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Old 02-20-2015, 10:01:35 PM
PnishrPW PnishrPW is offline
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Default Re: Onan Start Relay - One Size Fits All -

Napa ST-83 is also a 5 terminal unit, ~$18 locally. This is from a Jeep/AMC application.
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Old 02-21-2015, 12:59:09 AM
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Question Re: Onan Start Relay - One Size Fits All -

Quote:
Originally Posted by Jack Hottel View Post
I beg to differ . Onan PN 307-0845 connot be replaced with a 4 terminal device. The I terminal is needed as an isolated source of 12V. Here is a link.
Jack Hottel
http://www.smokstak.com/forum/showth...d+for+307-0845
From the link-


"From what I have read (and verified by the pictures), the solenoid has an insulated case. The coil is always hooked to 12V+ though the large battery input terminal on the left. It is activated by the small S terminal when 12V- is applied. The I terminal becomes 12V+ during crank through the copper foil shown in the picture."

The large terminal that's connected to the start winding goes positive on crank. Why have a separate terminal?
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Old 02-21-2015, 01:06:07 AM
PnishrPW PnishrPW is offline
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Default Re: Onan Start Relay - One Size Fits All -

"I" terminal is generally used for sisson choke equipped models.
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Old 02-21-2015, 01:20:57 AM
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Default Re: Onan Start Relay - One Size Fits All -

Quote:
Originally Posted by Kpack View Post
Good work. How did you come up with those numbers that's great news ?
Thanks!
I cheated. I have a Cole-Hersee catalog that shows the internal wiring of each solenoid. The12V relay with an isolated coil is Cole-Hersee number 24023
I crossed 24023 on line and got all the interchanges. There are more, too. LOTS more.
Just type in Ford SW220 or Cole-Hersee 24023.

Quote:
Originally Posted by PnishrPW View Post
"I" terminal is generally used for sisson choke equipped models.
And it only receives power when cranking? And if so, why isn't it just connected to the start winding terminal?

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Originally Posted by Lloyd H View Post
Jeep used a ford type solenoid that had an isolated coil plus an "I" terminal as well. 5 terminals total
If I remember correctly, the "I" was "Ignition". It bypassed the ballast resistor and supplied 12V to the coil for a hotter spark when cranking.
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Old 02-21-2015, 03:21:12 AM
PnishrPW PnishrPW is offline
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Default Re: Onan Start Relay - One Size Fits All -

Backfeed would keep choke on.
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