Six volt systems typically use primary windings in the coil of .6 to 2 ohms.
Twelve volt systems (with breaker points) tend to use the same coils with external resistors giving an additional 1.2 - 1.4 ohms in primary resistance.
Twelve volt systems with NO external resistor tend to use the same total primary resistance built into the coil-can. I.e. .6 - 1.8 ohms in the can plus 1.2 - 1.4 ohms external = 1.8 - 3.2 ohms total (and sometime higher).
12 volt breakerless systems often use "six volt" type coils with no external resistor.
A500 12 volt 2.6 ohms primary, 9.8 ohms secondary no external resistor used.
Echlin 4.2 ohms, 4.82M secondary (no ext resistor)
John Deere 6 volt (as used on 430, 1010, etc.) 2.6 ohms prim, 7.12 secondary. Same coil used on Deere tractors with 12 volt systems with added resistor.
Hot Spark brand - HS06HEC - 12 volt HEI, CDI and electronic ignition systems requiring a coil with 0.6 Ohms primary resistance. 11.6 K ohms secondary. HEI, CDI and electronic ignition systems requiring a coil with 0.6 Ohms primary resistance. Can also be used as a 6-volt coil for many applications.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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