Coil problem again

[Rinker85]

Can someone please give me test procedures to make sure the correct voltage is going to the coil under running conditions?
I am on my 3rd coil in 3 years. Every summer since 2017 I have replaced the coil in late July or August. Same symptoms.. Boat runs fine for 40 minutes then all kinds of power problems. I replace the coil and the problems disappear for 1 year.

The points are good. Plugs are good. The Dwell is fine as well as the timing. What could be ruining the coil the past 3 years. I've never had this problem before. I've had the boat since 1992. Its a 1984 2.5 L OMC.

Thank you

 

[Howard Sterndrive]

What coil you using? Go to Napa and get a 1C14SB coil and run it direct from the ignition, bypassing the resistor wire. That NAPA coil runs at full battery voltage, it is in a heavy steel can and lasts for years and years.

 

[Scott Danforth]

you cant run points and bypass the ballast wire. you will burn the points up.

a bad condensor would cause what you are seeing.

 

[Howard Sterndrive]

you cant run points and bypass the ballast wire. you will burn the points up.

a bad condensor would cause what you are seeing.

I did in 2001- my points are fine. (and it's IC14SB, not 1C14SB - I can't edit previous post)

 

[Rinker85]

What coil you using? Go to Napa and get a 1C14SB coil and run it direct from the ignition, bypassing the resistor wire. That NAPA coil runs at full battery voltage, it is in a heavy steel can and lasts for years and years.

I'm using a Sierra Marine 18-5437 coil

 

[Rinker85]

you cant run points and bypass the ballast wire. you will burn the points up.

a bad condensor would cause what you are seeing.

I replaced the coil and it runs just fine once again. I'm going to test the resistor wire next. As far as the points and condenser I replace them every spring. Could something be causing the condenser to go bad which would cause the coil to act up?