I was given a 5 1/2 Johnson motor. Model #cd-20c, ser# 2314328. It doesn't run, I'm not getting spark to the plugs, and when I pulled a coil to check it the plug wire just fell off. Could this be the problem? If not how do I check the coil? Iwould also like to know the year, and where I can get a service manual. Thanks for any info.