Posted by Jerry/MT on June 27, 2008 at 19:50:13 from (206.183.116.129):
In Reply to: coil voltage posted by lee9588 on June 27, 2008 at 09:29:11:
To answer simply-12V. However, since most primary ignition circuits are designed to carry about 4 amps maximum current continuous without overheating, that means the resistance from the battery, through the key switch to the coil to the distributor to ground is something like 3.15 ohms ( 12.6 V/4 amps= 3.15 ohms). The biggest part of that resistance is (or should be) the coil primary winding.
I checked a 6 V coil and it had a resistance of 1.6 ohms so that would say that the it needs another 1.6 ohms to be able to be used on a 12v system and not pass over 4 amps of primary current.
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