Farmall Super A - No Spark

Hi all...

I have a Farmall Super A. Ran fine all season, sat for a bit and now it won't start. Checked plugs, etc. and had weak irregular spark. Decided everything was due and replaced plugs, wires, coil, cap and condenser. Now it still won't start and I have very irregular to non-existent spark at plugs. I have juice on both terminals of the coil.(negative is constant when switch is open and positive is pulsing with cranking) I do not have any juice at plug ends or on the center wire of the coil/distributor.(not sure if/when I should there) *pardon me being mostly electrically ignorant. : - /

Any thoughts, info, ideas much appreciated...

Thanks
Brian
 
Hey brian, my super a will take spells where it won't start at all, but I can get someone to pull me off and it will fire up and run good, you can turn it off and it will start back just fine, not sure why
 
(quoted from post at 22:20:50 11/22/14) Hi all...

I have a Farmall Super A. Ran fine all season, sat for a bit and now it won't start. Checked plugs, etc. and had weak irregular spark. Decided everything was due and replaced plugs, wires, coil, cap and condenser. Now it still won't start and I have very irregular to non-existent spark at plugs. I have juice on both terminals of the coil.(negative is constant when switch is open and positive is pulsing with cranking) I do not have any juice at plug ends or on the center wire of the coil/distributor.(not sure if/when I should there) *pardon me being mostly electrically ignorant. : - /

Any thoughts, info, ideas much appreciated...

Thanks
Brian

You may have done it, but did you replace the points??? If you did then your coil may be bad..........
 
Check your battery voltage at the coil when making a start. Your battery voltage may be dropping too low during cranking. Try pull starting the tractor. Hal
 
Lightly clean the points with brake cleaner or lacquer thinner & slide a dollar bill between closed points to remove any manufacturing residue.
 
you replaced parts that will very seldom prevent an engine from starting.
#1 have good battery.
#2 check points, clean or replace. set gap to spec's, and then set timing.
the other parts will make an engine run terrible but it can still start.
the reason you clean points is because when they sit in closed position they will form a corrosion that will prevent contact.
 
I would remove the points use a motor driven wirebrush and buff them till they shine. Sometimes a film will get there and then they do not make a good contac. Just had to do that to a 400 weak spark. Cleaned them and replaced great spark installed back on engine and it fired like a new tractor second time within two weeks found same problem. Both times had complete circut to the block on the dist thats why i cleaned the points.
 
I would definately replace the points since you
replaced everything else. IF they don't let good
current flow thru them you won't have good current
flowing thru your coil for a good spark. Make sure
you have fuel getting in the cylinders.
 
You probably avoided replacing the points because you were worried about setting the gap. Don't worry about it and go ahead and replace them.
 

Thanks all - moron (me) had the coil flipped also went and did the points too. I was still getting spark but the old ones where real bad looking - the two points had actually "mushed" each other out of shape from years of impact I guess. Anyway have good spark all around.

Now seem to be having a carb issue though....
 

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