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Old Jul 9, 2005 | 07:50 PM
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Tach wire HELP FAST!

Hey guys, need some help here. I am installing a remote start ignition system with a new alarm. The alarm needs to read the tach wire so that it knows when to stop the starter from grinding. The truck is a 94 f-250 with the 351w. Which wire would be the hookup off of the ignition coil. There are 2 wires on a grey clip, one brown and one red w/ green stripe. Then there is another wire that is connected to a grey cylinder that is grounded off to the coil's mounting bracket. Which wire do I need? If I needed the wire and it was connected to the instrument cluster, what color should it be. The interior is torn apart doing this alarm install and I need to get it back fast! Thanks Again for your help!
 
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Old Jul 9, 2005 | 08:21 PM
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Old Jul 10, 2005 | 06:31 AM
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Old Jul 12, 2005 | 01:08 PM
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Is there no one out here that has put a tach on a 351W???
 
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Old Jul 12, 2005 | 03:05 PM
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The tach is fed off of the negative coil wire, likely the terminal with two wires, but check for 12V on the other wire with the key on to be sure.
 
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Old Jul 13, 2005 | 12:45 AM
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It should be a green wire, on the connecter that goes into the coil.
 
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Old Jul 13, 2005 | 11:50 PM
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thanks yall found out by turning the key to the "run" position with the clip pulled out of the coil and seeing which one had 12V power and the other one was the ground, just so future members know how.
 
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