[AT] question on use of resistor on coil

[pga2 at hot1.net]

Cecil,
You most definitely need the 6V coil. The 12V coil won't put out a strong 
spark when used on a 6V system. I would definitely replace the points as 
well, and probably the condensor too.

Phil




----- Original Message -----
>From    : Cecil E Monson <cmonson at hvc.rr.com>
Sent    : Sat, 23 Oct 2004 07:18:52 -0400
To      : Antique tractor email discussion group <at at lists.antique-tractor.
com>
Subject : [AT] question on use of resistor on coil


>	I've been trying to get my JD 420 crawler to start after sitting
all summer. At first I had no spark. With the loader down and the hood
on the tractor, it is almost impossible to get to the coil and to where
you can see to work on the distributor. I took the hydraulic connections
apart yesterday and got the hood off. Substituted a new coil for the old
one without success. Took the cap and rotor off the distributor and used
a "point file" I got at Sears to clean up the points. Now I have a sort
of yellow spark when I lay a spark plug where it is grounded and crank
the engine over. The yellow spark indicates to me it is a weak spark
or still bad contacts at the points.

	The question is - the coil came out of the box with a note saying
it must be used with a resistor but no resistor is there. I figured that
being as it is marked 12 volts on the coil and I'm using it on a 6 volt
system, I should not need a resistor. Is this true or do both 6 volt and
12 volt systems use the same coil with a resistor?

	Another question is that I can feel pitting on the points on one
side when I run the file over them. Would you just change out the points on
general principals?  I have already changed out the condenser as I initially
thought it might be the problem.

	In case someone wonders about fuel, I smell gas in the exhaust when
cranking so it is getting gas.

Cecil
-- 
The nicest thing about telling the truth is you never have to wonder
what you said.

Cecil E Monson
Lucille Hand-Monson
Mountainville, New York   Just a little east of the North Pole

Allis Chalmers tractors and equipment

Free advice

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