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 - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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