Tachometer to ignition coil

[mcannon]

Just bought a 2002 deck boat with a 1998 305 CID 5.0L with Thunderbolt V. Tach not working. Connections on back OK. I noticed that there is only one grey wire on negative terminal of ignition coil. Manual says should be 2; one to tach and one from the ignition module. No evidence broken wire.

1. Any harm me running a test wire from coil to tach? Could the wire have been removed for some good reason?
2. Any chance the two grey wires are spliced somewhere hence only one on the coil?
3. Could try to find a test tach, but #1 would be a lot quicker.

Anybadvice appreciated.
mcannon

 

[Bt Doctur]

there is a grey wire from the harness and a grey wire from the module mounted on the dist body

 

[kghost]

Just bought a 2002 deck boat with a 1998 305 CID 5.0L with Thunderbolt V. Tach not working. Connections on back OK. I noticed that there is only one grey wire on negative terminal of ignition coil. Manual says should be 2; one to tach and one from the ignition module. No evidence broken wire.

1. Any harm me running a test wire from coil to tach? Could the wire have been removed for some good reason?

No harm in doing this just remove existing wire on back of tach fiirst


2. Any chance the two grey wires are spliced somewhere hence only one on the coil?

Very possible in fact the factory manual schematic is kind of drawn to suggest that


3. Could try to find a test tach, but #1 would be a lot quicker.

Anybadvice appreciated.
mcannon

Also look at back of tach, there should be a selector switch for 4, 6 , 8 cylinders. Sometimes moving from one back to the correct one may work.

 

[Eddieo]

I had the same proble on a 2002 Godfrey deck boat. just replaced my tac now it works fine.