Am I hooking up this tach correctly - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-17-2008, 08:46 PM
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Am I hooking up this tach correctly

I have a tach with four wires and I have the red to power, white and green to positive on the coil and black for ground. It doesn't want to work when I fire the car up, the tach go's all the way up to about 10 grand. Any advice?

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Old 05-17-2008, 09:08 PM
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The white one is usualy for a light. Hook only the green to the coil pos.The others are right.
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Old 05-17-2008, 09:33 PM
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Try putting the green to the - side of the coil and white= illumination aka light. Tach wiring diagram
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Old 05-17-2008, 09:34 PM
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When all else fails, read the instructions...twice! You may have to program the tach to the number of cylinders of your engine. (as described in the instructions) Alot of dist. already have a terminal for the tach signal. (usually labeled "TACH" directly above it) hope this helps!
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Old 05-18-2008, 06:15 AM
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At first I didn't think the tach worked but I have another one that works for sure and it's doing the same thing. I've had the other one hooked with white and green together and it worked fine but in this car it won't work either way.When I put the green to the negative side of the coil the engine don't start.
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Old 05-18-2008, 09:42 AM
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Quote:
Originally Posted by STATUTORY GRAPE
At first I didn't think the tach worked but I have another one that works for sure and it's doing the same thing. I've had the other one hooked with white and green together and it worked fine but in this car it won't work either way.When I put the green to the negative side of the coil the engine don't start.
The tach pickup wire will need to be on the negative side of the coil not the positive side, the positive side is just a continuous 12 volt feed. Usually the pickup is the green wire but I would look at the instructions to be sure. If you have an MSD ignition dont connect anything to the coil terminals

Chet
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Old 05-18-2008, 09:46 AM
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The white and red could be tied together, not the white and green. The red being power and the white being power to the light. If you connect the white to the negative coil terminal it will effectivly short it to groung throuh the tach lamp.

Only 1 wire to the neg side. green !!

Chet
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