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M20 tachometer conversion woes...


Guest Anonymous

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Guest Anonymous

Ok, so I just got my tach back from North Hollywood speedometer and I connected the #6 pin from the M20 325 harness to the old leads off of the tach and it does nothing. So I called them and they say run a wire from the negative of the coil to the tach and it still doesn't work. Anybody have any ideas? Thanks in advance... I know some of you have done it so where did you run the stinkin wires!

Curtis

'72 M20

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Guest Anonymous

bbqdrive73.JPG

URL: http://www.zeebuck.com/02bc/index.htm

side of the circuit, which is usually the negative terminal of the coil. Power is applied to the + terminal of the coil, and the ground connection to the - terminal is switched on and off directly by the Motronic brain, IIRC, thus firing the coil. The tach sees the voltage fluctuation on the - terminal as the ground is made and broken.

Is it possible that you have the coil primary wired backwards? If so the ignition should still fire, but the spark would be jumping from ground to center electrode and probably cause accelerated plug wear.

Also, did you re-connect the power wires to the tach, as well as the signal imput?

regards,

Zenon

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Guest Anonymous

I connected the dash side of it all the same as it came out. I will go try some more stuff today and make sure I have it all wired correctly. On the coil, I didn't think it was possible to wire it backwards as the eyelets are different sizes and so are the bolts they go on. Thanks!

Curtis

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