Re: coil gets hot

Posted by John T on August 17, 2006 at 06:43:05 from (66.244.90.5):

In Reply to: coil gets hot posted by amo on August 16, 2006 at 17:16:11:

amo, if your coil is really???????? a 12 volt coil as you seem to imply, it shouldnt get hot and doesnt require any external ballast resistor HOWEVER if its a 6 volt coil (as I suspect) and you apply 12 volts, it will run so hot you can barely lay your hand on it and will eventually overheat.

NOTE if the coil is labeled something like "12 volts for use with external ballast" then its in reality a 6 volt coil and requires the use of a series external voltage dropping (12 to 6) ballast resistor wired after the ignition switch and before the coil. If it were a true full 12 volt rated coil (needs no ballast) it might be labeled "12 volts" or "12 volts NO external Ballast required"

If you measure the coils primary winding resistance (between its lil + and - terminals) you can tell if its a 6 or a 12 volt coil as the good Buick Man indicated, with around 1.5 ohms being a 6 volt but if closer to 3 0hms, a true full 12 volt coil.

Read any coil labels and measure its primary winding resistance and if its a 6 volt coil, go to NAPA or Central Tractor or Rural King or Tractor Supply etc etc and buy an external Ignition Ballast Resistor, they are aorund 1.5 to 1.85 ohms or so and wire it ahead of the coil in series with the feed down from the ignition switch.

John T

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