1982 johnson 70hp one cyl not firing

[loujoe]

I am working on this Johnson, two years ago it was rebuilt. Now the center coil is not firing . Tracing the power wire comming from the bus bar to the stator there is 12v, the two wires comming out of the stator have 0v. These wires go directly into a rectangular brown box in front of the coils. Three tan wires leave this box and go directly to the coils. Do these wires carry 12v's too, I cannot get voltage reading on any of the three wires. Yet two of the coils have good strong fire. Jumps 1/2 inch blue streak on my plug wire tester. I have ordered a manual any other help would be greatly appreciated.

Tuna Fish

 

[Dennisanoka]

Re: 1982 johnson 70hp one cyl not firing

Can you swap coils and see if the problem follows the coil in question?

 

[Dennisanoka]

Re: 1982 johnson 70hp one cyl not firing

Or spark plug wire?

 

[loujoe]

Re: 1982 johnson 70hp one cyl not firing

My plug wires are good I swaped the affected one. Tuna

 

[loujoe]

Re: 1982 johnson 70hp one cyl not firing

My plug wires are good I swaped the affected one. I will swap coils tomorrow thanks guys. Tuna fish

 

[jtexas]

Re: 1982 johnson 70hp one cyl not firing

those tan (they should actually be orange) wires from the coils - they carry pulses from the capacitor to the primary coils with a peak of 150V at cranking speed, but you need a DVA adapter to measure it.

here's a pretty comprehensive ignition troubleshooting guide: http://rapair.com/media/Troubleshooting Guide 2006.pdf

I bet swapping the ignition coils gives ya the answer.......

 

[loujoe]

Re: 1982 johnson 70hp one cyl not firing

Thanks Admiral I agree. T Fish

 

[Toddo1]

Re: 1982 johnson 70hp one cyl not firing

You might want to refer to this post...it turned out to be my timer base...

http://forums.iboats.com/showthread.php?p=1328532#post1328532