Posted by ScottyHOMEy on June 22, 2010 at 19:56:58 from (64.222.248.53):
In Reply to: Re: H Light Switch Wiring posted by Crazy Red Power in SE-WI on June 21, 2010 at 22:05:17:
Spot on the with functions of the different position of the switch. Startin from fully to the left and moving clockise, L(ow) is a low charge rate, achieved by passing the current through the flat resistor at the bottom of an an original switch (not the modern replacement Jeff in the pictures acompanying Jeff Z's excelent schematic), H(igh) is a higher rate of charge, D(im) and the B(right) lights. The guts of the switch are such that they leave a high rate of charge when the lights are illuminated.
As for the magneto vs. 3/4 position switch, it is a coincidental relationship. A magneto is totally isolated from the rest of the tractor's electrical system. It will operate and spark your fuel reagardless of the light switch in use. THat doesn't mean yours is a bogus observation. It only happens that IH transitioned from magneto to battery ignitions over the same few years that they evolved from using cutout relays (4-position switch) to voltage regulators (3 position swithces). with the 4-position and a cutout, the operator served as the voltage regulator to control the charge rate by choosing a position on the switch. Tractors delivered with the 3-position switch, the regulator took over that function, so that the switch only determined whether your lights were off/dim/bright.
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