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Discussing Checked Tach With Multi Meter in the 5.0 Mustangs Forum. 12 volts from battery 11 volts from coil good ground you guys think the tach ...

       

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Old April 6th, 2008, 12:47 PM   #1
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Checked Tach With Multi Meter


12 volts from battery
11 volts from coil
good ground

you guys think the tach went bad?
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Old April 6th, 2008, 12:50 PM   #2
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when the car is running the coil wire should be in A/C voltage, not D/C. I think you have the wrong coil wire going in to the tach. Thats the input to tell it how fast the engine is spinning. It creates an A/C voltage that goes up with RPM.
 
Old April 6th, 2008, 03:32 PM   #3
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ok ill just stick it into the other wire just to see what it does
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Old April 6th, 2008, 03:44 PM   #4
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You want to ground the black lead and use the red lead to test whichever wire you think is your tach signal wire coming off the coil. Like I said before its A/C so make sure you set the DMM to A/C voltage. The right wire will go up in voltage with RPM's. It was dk. green/yellow on the stock coil, but I remember you saying you had an aftermarket.
 
Old April 6th, 2008, 03:52 PM   #5
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well how bout this? can i just cut the wire that runs for the stock tach? and use it on the aftermarket?
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Old April 6th, 2008, 04:12 PM   #6
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Does your stock tach work right now? if so, then yes, but I would tap into it rather than cut it.
 
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