Coil tower?

[redrumjet]

I'm trying to diagnose a problem with my 1981 Mercury 25 outboard engine. In the service manual the process to troubleshoot the coil says to check the resistance between the + and - terminals, which I understand.

It then says to check between the coil tower and the + or - terminal. What is the coil tower? The coils are mounted on top of the engine block and the coils are coated in some type of non-conductive plastic, so I can't check resistance between the coil body and the terminals. Needless to say this portion of the test is not going well....

Any help?

Thanks

 

[wired247]

The coil tower is the part that the spark splug wire plugs into.

 

[redrumjet]

Thank you. That helps a lot. I checked the coils per the manual and one was not in spec.