Re: Found this just now on the net?


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Posted by Willy-N on Saturday, April 16, 2005 at 1:48AM :

In Reply to: Hooked up backwards makes them hot posted by chris case on Saturday, April 16, 2005 at 0:40AM :

Quote;
"Automotive coils are typically also designed to operate on three different current voltages: 6V for what few 6V automobiles still exist, 9V and 12V. The key here is that starting reliability is paramount for automobiles. On a cold, icy morning, the current draw of many cars' starters will drop system voltage to 9V or so. So the coil is designed to run on 9V power and starting under adverse conditions is assured... when the engine is running and the system voltage is in the normal 12-15V charging range, the current supply to the coil is routed through a ballast resistor to drop it to the correct 9V range. Otherwise the coil would overheat eventually and burn out."
Read this too;
Also they run at a lesser output when hooked up back wards which may cause more heat. 14% at low RPMs and up to 30% less output at high RPMs.
Mark H.



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