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Onan Ignition Coils - Substitue with something cheaper?


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  #21  
Old 01-10-2014, 11:13:05 PM
scoops scoops is offline
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Default Re: Onan Ignition Coils - Substitue with something cheaper?

I think yours are close enough to spec.
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  #22  
Old 01-11-2014, 12:38:44 AM
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Default Re: Onan Ignition Coils - Substitue with something cheaper?

Probably not bad, based on those readings...
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  #23  
Old 01-11-2014, 07:23:17 AM
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Default Re: Onan Ignition Coils - Substitue with something cheaper?

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Originally Posted by tdarden3k View Post
Is a ballast basically a large resister ? How would you configure it ? Why would you use it ?
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You're right, a ballast is just a high Wattage resistor. It is connected in series with the battery lead of the coil to lower the current drawn by the coil.

In theory, the resistor lowers the primary current even more when the engine is running and the 'on' periods of the coil are shorter, taking advantage of the inductance of the coil and getting just as hot a spark.

When cranking and at very low speeds, the resistance in the coil circuit can be a disadvantage. That's why some cars and trucks using a ballast-type coil have an extra set of contacts in the starter solenoid that bypass the ballast when cranking.

If the ballast goes bad, you can temporarily jumper across it but the coil will run hot and the points will quickly burn.

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  #24  
Old 05-11-2014, 07:26:41 PM
dacflyer dacflyer is offline
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Default Re: Onan Ignition Coils - Substitue with something cheaper?

i had a ordeal with my Emerald 1.
no spark..on 1 wire..no spark at all on the other. i assumed the coil was bad.
it was getting power, points were good. indicator bulb on coil showed good breaking points. i replaced the coil with a harley coil i borrowed from a friend..
same thing no spark...i knew it could not be a bad coil so i did further test,
used some scrap NEON HV cable i had laying around.. substituted for spark plug wires and retested.. i got vicious fire now.. come to find out the long spark plug wire was open..Original wires.
so i went to NAPA. i got a universal spark plug cable set ( for 4 cyl engine )
NAPA said they sold a lot of them for fork lifts. i could not find anything less.
so i got spare cables now..
anyway. the GEN. fired up..( now to deal with carb issues ) i reatached the original coil. and it works fine also.
the original spark plug wires are carbon impregnated cables, the NAPA cables are Wire.. better and should last for ever.
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  #25  
Old 05-12-2014, 12:01:08 PM
len k len k is offline
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Default Re: Onan Ignition Coils - Substitue with something cheaper?

Remove all jets and clean them, main adjustable one on bottom, 2 in carb bowel dip tube (one hides behind screw cap), & clean 2 on top by M+S if they are not sealed by press fit ball bearings. I also blow out the passageways with 150 psi air from a big tank. I didn't bother with my idle adjustable jet.

Last edited by len k; 05-12-2014 at 12:16:05 PM.
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