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Farmall & IHC Tractors Discussion Board

Re: 300 burns up points


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Posted by John T on October 27, 2014 at 06:09:21 from (216.249.72.121):

In Reply to: 300 burns up points posted by VaGasman on October 26, 2014 at 18:32:11:

There can be a few (and more) reasons for premature point failure.

1) Excess coil current, it should be in the range of 4 and less amps.

2) Weak or completely open Condensor or one that's not the right size (MFD Rating).

3) Coil with too low LV Primary Resistance (thus allowing more then 4 amps of current the points have to switch)

See if that coil has a LV primary winding resistance (between little + and - terminals) of around 2.5 to 4 ohms????????? If so it should be fine on 12 volts no ballast required. If its way less, like 1.2 to 2 ohms IT NEEDS AN EXTERNAL SERIES VOLTAGE DROPPING (12 TO 6) BALLAST RESISTOR otherwise the points will burn up quickly.

A 12 volt coil may be labeled "12 Volts" or "12 Volts NOT for use with Ballast" HOWEVER if tis labeled "12 Volts requires Ballast resistor" its a 6 volt coil and needs the ballast or it will run hot and the points burn up quickly.

I suspect the coil may be a 6 volt unit or needs a ballast resistor therefore its causing excess current burning up the points or else the condenser is bad or open or not wired correct or the points are just junk quality

John T


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