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12 Volt conversions

C

Curt Cooke

Member
Saw one yesterday, the resister is installed between the coil and the distributor. I can't say that I've ever seen that but the more I thought about it, I wonder if it makes any difference. Seems that they are usually between the switch and the coil. Does it matter?
 
My guess is it wouldn't really matter unless there was a need for a resistor bypass while starting. But that doesn't come into play unless it's a high compression, large engine. Never seen the factory put one behind the coil, but probably for easy of manufacture and esthetics.
 
You will NEVER see ONE example of a system that left the factory like that.

While we all have seen some hack job where it's been done, I think adding resistance between the inductive and capacitive elements of the circuit will do nothing to enhance the spark at the plugs and likely will degrade it.
 
In theory it will not hurt or help but on most it is between the ignition switch and the coil. Years ago I could write you a long bunch of stuff explaining why it does not matter much if any but that was back when I was still an Electronics tec.
 
Donno-- originally the purpose was to reduce voltage to the coil, most had a by-pass @ starter solenoid to allow full voltage for starting. Now, the popular replacement coil has built-in resistor. On point type ignition, I can't see the need for resistor @ that location. wouldn't it defeat the system some?
 

Wired that way the coil is not protected by the resistor and won't live long.
 
When I changed my WD-45 over to 12 volts. I didn't put in a resister. Still has the original coil.Been like that for the last 15 years.
 
(quoted from post at 17:52:20 04/19/16) When I changed my WD-45 over to 12 volts. I didn't put in a resister. Still has the original coil.Been like that for the last 15 years.
Click to expand...

Did you convert it from a magneto or does it still have the original coil?
 
(quoted from post at 18:05:42 04/19/16)
(quoted from post at 17:52:20 04/19/16) When I changed my WD-45 over to 12 volts. I didn't put in a resister. Still has the original coil.Been like that for the last 15 years.
Click to expand...

Did you convert it from a magneto or does it still have the original coil?
Click to expand...

OOOOOPs! I see now that you said that it DOES have the original coil! I wonder, could there be extra resistance (corroded terminal, etc.) in the coil wire circuit? Maybe it's not getting 12v to the coil or maybe you're just living right! :)
 
(quoted from post at 17:05:42 04/19/16)
(quoted from post at 17:52:20 04/19/16) When I changed my WD-45 over to 12 volts. I didn't put in a resister. Still has the original coil.Been like that for the last 15 years.
Click to expand...

Did you convert it from a magneto or does it still have the original coil?
Click to expand...

It was a 6 volt distributor/coil setup. I just changed the wiring around to work with - ground, and light bulbs to 12 volt. And a one wire alt. On my MH 44-6 I used an alternator and electronic regulator out of a Mustang. Didn't put a resister in that one eather.
 
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