First off I agree with Ol Bob there below. That being said, Id feel more comfy if I actually knew the coils primary winding resistance as measured between its little + and -terminals. If its in the vicinity of at least 2.5 prefferred 3 and over ohms, Id say it should be suitable for 12 volts no ballast required. Some lay persons call those "internally ballasted" or with internal resistor (which isnt so, see
HOWEVER if its less then 2.5 ohms, especially if its more like 1.5 THEN ID CALL THAT A 6 VOLT COIL OR "12 Volts for use with or requires external ballast" and Id expect it to overheat plus the points burn up quickly..
The other possibility is if the coil is only marginally suitable for 12 volts (say its internal primary resistance is 2.5 ohms) and the alternator is taking the battery up to over 14.8 volts THEN THE COIL MIGHT OVERHEAT
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Today's Featured Article - The Day Tractor Lovers Dream About - by Angus Crawford. The day started at five o'clock on the morning of Friday, the January 29, 1999. My father, my sister, my uncle, my cousin and myself all climbed into my uncle's Toyota van. It was six thirty in the morning and we had a long day ahead. We traveled for six and a half hours to our destination - a little country town with a population of no more then one hundred and fifty people (57 of them being children under the age of thirteen). We arrived hoping to meet up with a man we knew had over one
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