coil wire question

[jlh3rd]

i've searched the tach install threads...and what i need to know is.....what is the white wire for on the rt frnt coil....and the red/black wire ,which is common for all the coils...

 

thanks

[dingy]

The white wire goes to the TCI unit. It is the trigger wire for coil # 4.

 

Each coil has a separate circuit to the TCI.

 

The Red/Black wire is positive battery that is connected to each coil.

 

The coil is normally energized. If key is on , there should be 12 volts present on the Red/Black wire and each trigger wire to the coils.

 

When the spark plug fires, the TCI removes the trigger (ground) to that coil. When the trigger is removed, the coil field collapses, causing the spark plug to fire.

 

Tachs read this pulse on the coil trigger wire and convert this info into an RPM display.

 

Gary

[jlh3rd]

thanks for the quick reply.....exactly what i needed....