Johnson 1971 outboard no spark?

[seo4u]

I have a Johnson 1971 125 horse motor, Model 125ESL71C:
Boat was running good tell a fuse popped right next to the starter it is a 30 amp fuse as big as your finger nail replace the fuse now the boat does not have any spark? The fuse popped due to a 3 way switch that went bad. On the backside of the motor there is a coil and a mega amplifier is it common for one of those to go bad? How can I find out if one of these parts went bad? I have attached a picture of the coil and amplifier. Can you get me in the right direction?

If one of these parts commonly goes bad do you have these parts in stock?

 

[wilde1j]

Re: Johnson 1971 outboard no spark?

Start here:

http://forums.iboats.com/showthread.php?t=158071

 

[seo4u]

Re: Johnson 1971 outboard no spark?

Thanks Jim,

That is where I am at, the keyswitch turns the engine over, cranks with a lot of power> good there. I am just down to the coil or Amplifier dont know how offen this would go bad.

 

[wilde1j]

Re: Johnson 1971 outboard no spark?

No spark all cylinders?

BTW, I've not worked on a motor with the same ignition as yours ... an OEM shop manual would be invaluable here, as there are some very expensive ignition parts involved. I wouldn't hazard a guess at this point as to what's bad.