Re: Amperage required for 12 V coil

Posted by John T on April 23, 2006 at 11:24:15 from (66.244.90.5):

In Reply to: Amperage required for 12 V coil posted by Gene Davis (Ga.) on April 22, 2006 at 20:23:14:

Gene, the worst case/max amperage draw would be around 12.6 volts divided by the coils primary resistance as measured bwtween its lil + and - terminals. Theres less then a 100% duty cycle, however, cuz although the points are normally/usually closed, they do open often enough and wide enough to fire the coil, so the heat rating and heat dissipation of the could be a tad less then if the points were always closed, which they are not.

Typical 12 volt coil currents are 4 amps and under and their resistance somewhere around 3 ohms or so. An alternator rating of at least 4 amps may suffice, but if lights are used that could be marginal PLUS if an electric cluth is used on the mower, then you need a much higher amp alternator as they draw considerable amps themselves in addition to a 3 or 4 amp coil draw.

Best wishes, let us know how it turns out

John T

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