72 automatic Pertronix conversion- no tach

[Captain Obvious]

So... Who wants to send me an early current driven tach for some reverse engineering?

Madkaw, the relay system for the auto trans was originally tied into the tach, but only because it shorted across the advanced points contacts until the temperature came up. You can just disconnect that stuff.

And I made this up a little while ago for a different discussion. Doesn't add any new revelations here, but just in case:

 

 

[madkaw]

Okay- figured it out . Wrong order in the current trail. Had wrong black and white first going to + on coil . So swapped out other black and white to positive side of coil then other black and white connected to green and white and viola!
My confusion is when searching for 12volts ( all wires disconnected) ,I found black and white and hooked it to coil.


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[madkaw]

Let me rephrase that statement- WE figured it out- thanks for the help guys.

So if someone was to ask me to help do this I would say -

Forget all the wires but the two black and whites and the green and white( this is if eliminating ballast and automatic thermo relay)

Get your ohm meter and find the black and white and green white that has continuity.
Take that black and white and put it on the positive terminal of the coil.

Take the other black and white and solder it to the green and white .

Done .


What I did wrong!
Disconnected everything and started from scratch . BUT I also looked for 12 volt source with all wired disconnected . When I did find 12 volts wire I used it for positive coil . I should have used the other black and white.

Hope all this makes sense


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[madkaw]

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[madkaw]

Ready for prime time!


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[grannyknot]

7 hours ago, madkaw said:

Okay- figured it out . Wrong order in the current trail. Had wrong black and white first going to + on coil . So swapped out other black and white to positive side of coil then other black and white connected to green and white and viola!
My confusion is when searching for 12volts ( all wires disconnected) ,I found black and white and hooked it to coil.


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ahem ahem, see post 6

[madkaw]

Yeah, but with a disclaimer -, didn't work over 4K .
I should have read more carefully Chris


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[Captain Obvious]

Excellent. Another crises averted. Glad you figured it out!