24 hp onan

[anderkart]

i think, when the points contact the light comes on ..

Double check that, It might just help us out here.


BriggsTwins has a good idea there. If the old spark plug wires unplug from the coil, try some others or you could even rig it up with lengths of regular electrical wire as a quick easy test.

Gearstix kinda gave me the idea that you should test to see if you get spark from either of your coils 2 outputs when the other spark plug wire is completly removed from the coil. (try each side this way)

 

[zanegrey]

when the points close that completes the the circuit..

 

[anderkart]

Yep, thats why I said you shouldn't be getting any testlight illumination on the coils negative terminal while the points are closed and grounding it.

 

[zanegrey]

do u think that means the coil is good ?

 

[anderkart]

A coil isn't necessarily still good just because it still passes current through the + to - primary wire connections.

You've made some comments that make me wonder about a couple things here:
Did you ever confirm if your battery cables are correctly hooked up (Negative battery cable should be bolted to the engine block)
And exactly when does your passive test light blink when connected between the coils negative primary terminal and ground? Does it light up with the points closed or open?

This is a fairly simple system. The points just need to be in good condition and properly adjusted. Here's some tips on that: http://www.google.com/search?source...z=1T4DMUS_enUS221US222&q=adjusting+points+gap

Your condenser could probably be substituted with one off any old 60's ford car engine as a cheap easy test.

At that point, If the wiring all checks out and the coil still wont produce spark, we'd just have to assume its defective.

 

[zanegrey]

first .. thank you for sticking with me..

the positive and negative are correct (that is bat cables)
i tried to run the positve bat cable thru the spark plug wires to the light to negative ..

no light..on either of the spark plug wires..i guess this is not a good test becoz of the resistance or the spark plug wire..

i did run a wire from the spark plug tower to a pug and to a light ..nothing..

i am going to check the spark plug wire and plug on my truck to see if they are good...

 

[zanegrey]

ok..

one of the spark plug wires did not produce spark and the other did..

both plugs did produce spark..

 

[anderkart]

i am going to check the spark plug wire and plug on my truck to see if they are good...

Make sure that Onan spark plugs electrode isn't longer than your trucks, so it doesnt bust a hole in yer piston...

 

[zanegrey]

i just plugged in the spark plug wire to the dizzy and gounded the spark plug to the valve cover...

 

[anderkart]

Cool.

 

[zanegrey]

i have found a universal condensor at the local parts store ..

do you think there is a difference in the reistance ..?

they both are 12 volts..

 

[anderkart]

Yeah they come in diferent resistance values to maximise point life but I'd think most any condenser made for 12 volt operation should function in your engine.

 

[zanegrey]

the local one is a dollar or two more than the direct replacement condesor but the direct replacement from onan is thirty miles away..

the coil itself is almost 100 dollars..

i am hoping it is the condensor ..

 

[zanegrey]

ok..

i have done some tinkering so bear with me..

i used a coil from my nissan truck and wired it the onan ..wala spark..


if you don't mind take a look at the previous pics and tell me if you think the coil sparks on both towers at the same time..??

i am thinking i could wire two coils in to get spark to both cylinders or do i just try to pull spark off on one (nissan) coil to feed both spark plugs ?

i am also taking this to mean that the existing coil is bad and not the condensor..

lmk what you think..

please and thank you..

 

[BriggsTwins]

one coil should be able to feed each cylinder. my twin just uses one coil with two wires, sparking on each side every revolution....your getting close fire that pig up

 

[zanegrey]

well do you think 2 coils will be too much for the time being ??

i have the problem of just being able to plug one plug wire into one coil..

i would have to fashion a plug wire with one coil input and two spark plug outlets..

 

[zanegrey]

i called my local guy and he thinks that 2 coils will not hurt n e thing ..

so i have some fab work to do ..b4 i light this pig up...

i will get a picture of my coil set up when..

 

[zanegrey]

i did a preliminary test on a 2 coil system ..

when the power is on and the points are closed the points want to heat up pretty fast..

if i get it running i may just fashion a coil wire for a one coil set up..

as i look at this engine i see that the cylinders are kind of off set ..

is this so that both cylinders combust at the same time or do they combust opposite of each other ??

i have to recharge my battery before i can actually try to start it..

 

[BriggsTwins]

while one is firing the other is completing and pushing out exhaust.

 

[zanegrey]

but does the spark plug fire every rotation on both cylinders ??