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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #1  
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Yochstein Yochstein is offline
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Default Late 84 Tachometer signal wire

I put my original tach back on the bike today. The pink wire is the signal wire for that tach that I know runs to the coil. My question is what side of the coil catches the signal? Does it matter which side gets the wire? My coils are not OEM with a blade terminal for this wire. These are from Pertronix which is the same place I got my ignition system. I don't want to risk frying anything if possible.
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left side if 2 pole,,,,,,,,,,,,, or 3 pole,,,,................if setting it up with just the pink wire,,,,, left side of the coil,, all the way,,,,,,,,,,,,, 2 or 3 pole,,, i run on the left side of my ultima iggy 3 pole coil,,,,,,,,,,,,,,, and left side on the dyna ,s 2 pole coil,,,,negative side,,,,,,,,,, left side,,,,,,,,,,,,,with the spark plug terminals on the coil,,,,,,,,,,,,,,,, facing you,,,,,,,,,,,,,
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I dug up my compufire instructions. There are 2 wires from the unit to the coil. Black to one pole and red to the other. The red wire shares the connection to the ignition switch.
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Originally Posted by Yochstein View Post
I dug up my compufire instructions. There are 2 wires from the unit to the coil. Black to one pole and red to the other. The red wire shares the connection to the ignition switch.
You're using a Dual-Fire setup - Right?

Keyswitch is Power TO the Coil & RED wire extends that Power TO the Ignition Module...

Black wire FROM the Ignition Module is the COIL TRIGGER, which is where you want to take off for the Tachometer (using the PINK Tach Wire)...


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Quote:
Originally Posted by IXL2Relax View Post
You're using a Dual-Fire setup - Right?

Keyswitch is Power TO the Coil & RED wire extends that Power TO the Ignition Module...

Black wire FROM the Ignition Module is the COIL TRIGGER, which is where you want to take off for the Tachometer (using the PINK Tach Wire)...


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Yes, it is a dual fire module. Thank you very much for clarifying.
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It worked like a charm. Thanks so much.
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It worked like a charm. Thanks so much.
Glad to be of help - Enjoy the ride...

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