[AT] question on use of resistor on coil

Cecil E Monson cmonson at hvc.rr.com
Mon Oct 25 09:48:22 PDT 2004


> Cecil, if you have a coil that says 12 volts on it I would be curious as to
> what its' internal resistance is if you can readily take the measurement.
> 
> You also stated that the voltage at the coil dropped to under 5 volts when
> you checked it with the ohmmeter -- I am not sure what you meant by this.
>   I connected my meter to the coil (and to the tractor frame) on my T035 and
> turned the ignition on and read 6.1-6.2 volts on the meter.  I then hit the
> starter and, while grinding, the voltage reading dropped to just under 5
> volts.  Is this anything like what you did?
> 
> Dudley
> Snohomish, Washington


	Dudley, I measured the coil that has the words "12 volts" painted
on the outside of it and it measured exactly the same as my other coils -
all of which are 6 volts. I used my Beckman digital VOM and got 1.6 ohms
on all four of the coils I have. Three are 6 volts for sure and the one
is marked 12 volts but is most likely a 6 volt coil. It has a resistor in
the box with it which I am sure is for use on a 12 volt system. This
resistor measured 1.5 ohms.

	FWIW, and I don't know if it means a thing, one of the coils is
one of the new Bosch extra high voltage coils. It measured the same as
the others.

	As to the voltage I measured that I referred to as less than
5 volts, yes, it was when I was cranking the engine. Up to then, it
measured about 6.3 volts as it was on the charger. Also, I left the
charger on when trying to start the tractor.

	So, I as soon as I can get to it, I am going to change out the
points and the spark plugs also and see if I can't put an end to this.

	Thanks again for your help.

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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