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'73 tach help, please.


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When I dug into my wagon's wiring issues (before the car ran) I noticed that the factory, orange, 3-wire tach had the black wire to ground, the Green to 12V, and the Green/Black to the negative side of the coil. I reversed the two, putting Black to 12V (which felt very wrong) and the green to ground.

 

I finally got the car to start and the tach doesn't work.

 

I did not put the green and black wires back to where I found them. Info on the web is contradictory, regarding the wiring.

 

Is it fried?

 

If it's fried, what part fails? Even if I have to replace items on the board, I will fix this tach.

 

 

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Green should go to power (switched or not), black to ground and the white wires going back to the engine compartment and hooking up more or less to the positive side of the coil. Like you, I found much of the information contradictory when searching. Here is a link to another thread that might be useful and a crude image showing how the white wires should connect:

 

http://www.the510realm.com/viewtopic.php?f=32&t=25745&hilit=tach

 

 

 

Wiring_zps8664ff8f.jpg

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