Well I have spent two days searching over the 50,000 posts and have found my self lost in a sea of anguish. Ive got an early 70ish 115 johnson outboard that seems to be in very good condition but will not start due to low spark. It has enough to give you a good zap and seems to firing in a regulator pattern but not enough to visibly see spark to the motor. This motor has the old style ignition with a single coil pack, small round rectifier, and what i believe is the non water cooled voltage regulator next to it. I found the info on testing the rectifier that I will test today but I believe that its having charging issues. I also read that the ignition system is powered directly from the charging system and not from battery power. I did notice that there is a random (obviously added by some one) a power wire running haphazardly from the positive post of the starter motor to the power terminal supplying power to the ignition box. Under cranking conditions I measured 7v on that terminal and I believe that my be where the power for the ignition system is coming from rather than the charging system. anyone have a diagram or know what the voltages I should have coming out of the regulator / to the ignition / etc. should be? I would guess 12vdc but Im not an outboard tech. Thank you all for the wealth of information!
(ill take some pics today, that may help)
Jason Woods
Northern CA
(ill take some pics today, that may help)
Jason Woods
Northern CA