Posted by Bob on June 21, 2010 at 08:32:03 from (69.178.228.68):
In Reply to: ? about Coils posted by Brad Gyde on June 21, 2010 at 08:22:02:
In round numbers, coils with up to about 2.5 Ohms primary resistance are 6 Volt coils (can be used on 12 Volts with the appropriate resistor).
Coils with a primary resistance more in the 3 to 3.5 Ohms range can be used on 12 Volts WITHOUT an external resistor.
An easy test is to measure the AMPERAGE draw of the ignition system, switch on, engine stopped, points closed. Generally, the current needs to be in the 3 - 4 Amp range. Much over 4 Amps shortens point life and makes the coil run HOT. If it's BELOW the 3 Amp range, spark is gonna be weak.
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