07-24-2006, 10:49 PM | #11 |
Administrator
Join Date: Dec 2004
Location: Huntsville, AL
Posts: 14,774
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Re: Tach problem
If you hook up the voltmeter backwards, the signal will be negative. If you had hooked it up the other way, it should have been positive. Like Brian said, though, it should be AC, not DC, meaning the polarity would alternate.
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1998 Mustang GT Coupe - World's Slowest Racecar 2005 Toyota 4Runner SR5 V8 2013 Volkswagen Jetta Sportwagen TDI |
07-25-2006, 06:52 AM | #12 | ||
Daddy x4 ...we're done
Join Date: Dec 2004
Location: Oxford, AL
Posts: 11,551
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Re: Tach problem
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07-25-2006, 10:05 AM | #13 |
Super Moderator
Join Date: Dec 2004
Location: on the water
Posts: 1,280
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Re: Tach problem
Did you by the plug and play harness for the MSD or did you splice the wires into the factory harness? If I remember correctly, the white wire from the MSD is the trigger wire for the tach signal that picks up off the trigger wire for the ECC. If there is a good connection there then you may need to take the MSD back to the seller and swap it out for a new one. If you got it at SECO they should be able to test it for you. I know they did on mine when the MSD went bad and was sparking when it wanted to.
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07-25-2006, 10:33 AM | #14 |
Senior Member
Join Date: Mar 2005
Posts: 515
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Re: Tach problem
It was in the car when I got it. I'll check the white wire when I get home in a couple hours.
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