Re: M burning points

Posted by John T on May 31, 2006 at 09:31:01 from (66.244.90.5):

In Reply to: Re: M burning points posted by Wicksfield on May 31, 2006 at 08:05:56:

Wick, if the points are deeply pitted on one side thats indicitave of a bad or weak but more often AN IMPROPER SIZE CONDENSOR to match up with your coil. I fear your coil isnt matched up as far as ohms (need around 3 ohms) and inductance with whatever condensor microfarads you have. The mis match where the condensor isnt the correct size to match the coils inductance and resistance causes premature point burn up. You need to get a regular IHC 12 volt (NOT for use with external ballast i.e. NO ballst required) coil and a condensor to match and that should solve the problem.

I think that generic coil you claim is for use WITH OR WITHOUT a Ballast just isnt matching up with your condensor rating which is causing the points to burn up prematurely OR ELSE ITS SIMPLY WAY TOOOOOOO LOW OHMSSSSSS (should be near 3 ohms). For use "with or without" a ballast doesnt make good engineering sense to me for an old fashioned tractor points n condensor coil ignition system which ought to have sufficient total primary (coil + any external ballast) resistance to limit the current switched to around 4 amps or so MAX. REMEMBER EITHER excess current (over 4 maps) or a weak or mis sized condensor causes premature points burn up.

I suspect that coils primary (between lil + and - terminals) is under 2 ohms and that excess current is frying the points, or else the condensor is wayyyyyyyy off size in microfarads to match up correctly with that coils inductance, hence no capacitive action, frying the points.

The other alternative would be to use the old 6 volt coil and an external ballast of around 1.5 to 1.85 ohms (typical sizes on those ignitions) and the stock condensor from IHC CUZ IM NOT TRUSTING THAT SUPPOSED DUAL PURPOSE COIL ONE BIT LOL

John T

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