Factory Tach Question.
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Factory Tach Question.
hey guys,
i have a question about the factory tach.
we bought a cluster about a year ago with the factory tach.we installed it and it worked fine.but now we put a new coil in the truck,now the tach will not work.it will jump when you first turn the key on,then it dose nothing.
but the neg side of the coil has current on it is that right??
the new coil is a Ford TFI Coil, Street Fire
i have a question about the factory tach.
we bought a cluster about a year ago with the factory tach.we installed it and it worked fine.but now we put a new coil in the truck,now the tach will not work.it will jump when you first turn the key on,then it dose nothing.
but the neg side of the coil has current on it is that right??
the new coil is a Ford TFI Coil, Street Fire
Cargo Master
Joined: Mar 2008
Posts: 2,565
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From: Washington
What year truck? Engine type?
What type of ignition module are you using?
Just plug the old coil back in for a quick test, just the wires no need to bolt it in, to see if the Tach is good.
Why did you have to buy a new coil? Did something break?
Jim
What type of ignition module are you using?
Just plug the old coil back in for a quick test, just the wires no need to bolt it in, to see if the Tach is good.
Why did you have to buy a new coil? Did something break?
Jim
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its a 85 f150 with a 4.9 300 inline6
we replace the coil,cap,plug wires.
it was working before we parked it.now after we got the engine back together it just jumps.
also, the neg side of the coil is hot. is that right?
we replace the coil,cap,plug wires.
it was working before we parked it.now after we got the engine back together it just jumps.
also, the neg side of the coil is hot. is that right?
Cargo Master
Joined: Mar 2008
Posts: 2,565
Likes: 207
From: Washington
The answer to the amount of voltage present at the NEG side of the coil depends on the type of IGN module you have and where it is running.
Are you using the stock one that is mounted on the Dist?
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what do you mean???
Cargo Master
Joined: Mar 2008
Posts: 2,565
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From: Washington
If you are using a test light, the light will glow the same on both side of the coil with the key ON and engine not running. Same voltage on both sides of the coil.
When the engine is running the NEG side of the coil will have less voltage, or a dimmer test light.
When the engine is running the NEG side of the coil will have less voltage, or a dimmer test light.
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Apr 8, 2013 05:41 PM