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Discussion Starter · #1 ·
Is there a test I can perform to see if this ignition is ok? The part
is not on the bike. (1975 GL1000). Keep in mind I am somewhat
electrically challenged.
 

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Which Dyna? ..."S" or "III"

The "S" ignition is easier to test off the bike as there is less "stuff" to hook up.
Hahaha, I made a funny - Dyna "S" = "Stuff" cause that's what they did to those modules; they stuffed 'em full of stuff.

I've Dyna troubleshooting guides HERE. Use the drop-down menu then pick the one you want.
HERE is the Dyna "S" T/S guide.
HERE is the Dyna "III" T/S guide.

If you've a power supply and a meter you can bench test them for operation. You'll test if the triggers (modules) are working or not.
 

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Discussion Starter · #4 ·
I have the "S"
I did a resistance reading and one side is open but the otherside shows resistance.
 

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If you did that test with no power to the module, I'd say that the open module is bad.
Those modules are normally closed. Magnets trigger a open circuit condition.
Put 12Vdc to the red wire and ground the plate for test. Swing the rotor magnet past the module (powered-up) and see what happens.
I'm guessing it is the left module; 3/4 cylinders (or the white wire) that is the open module.
 
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