I have a 77 Johnson 25 electric start and it won't start. I looked at both plugs and both are not getting spark. I know there is a little fuse and I checked that and it's good. A buddy had a old motor sitting around that he gave me. I pulled the powerpack off it and tried and still no spark. Not sure what else to try now. I don't even know if the powerpack is any good from the motor my buddy gave me. Any help?