Posted by Jon Hagen on June 27, 2008 at 09:43:33 from (12.175.230.58):
In Reply to: coil voltage posted by lee9588 on June 27, 2008 at 09:29:11:
It depends on the coil you are using, a coil that measures 1.5 ohms across the primary winding needs a resistor of about 1.5 ohms inline to the coil to work on 12V a coil that measures aprox 3 ohms across the primary winding does not need a resistor.
One caution when you are measuring voltage at the coil, make sure the points are closed when measuring voltage. A system with an inline resistor will measure voltage dropped from 12V to around 6V-7V at the coil with the points closed. with the points open, the resistor is not loaded and will not drop the voltage, so you will read full 12V inspite of the inline resistor.
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