Posted by LJD on December 16, 2012 at 06:57:14 from (75.194.255.21):
In Reply to: Ignition Resistors posted by K-Mo on December 16, 2012 at 04:19:16:
I think resistors have been talked to death here - but I'll add a few comments anyway.
12 volt systems are designed to make spark with 9 volts, not 12 volts. That because engines crank at 9 volts.
Dedicated external ignition resistors can be "fixed" or "reactive."
Some are wire-wound and some are carbon (built into a wire). GM and Deere used a lot of carbon wire resistors.
Fixed resistor usually uses a system to bypass them while the engine is cranking. Not the case though with a high-resistance coil when all the resistance is "inside the can."
Reactive resistor needs no bypass. It has low resistance until a load is on it and it heats up. Can cause a starting problem if the ignition is left on too long before cranking. Many older Ford tractors use them.
No way is the change from a 2 ohm (fixed) to a 1.8 ohm (fixed) going to fix a no-start situation if all else is as it should be.
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