I had an issue on my SPX (787 engine) where I was having some sort of internal voltage issues. I discovered that some of the fuses built onto the MPEM were only getting 5v or so (measuring the tops of the fuses). Since the MPEM was broken anyway, so I decided to "try something". I ran a power wire to both parts of that fuse link and got spark back. I put a fuse in-line on that power wire and made it permanent. Later, I discovered that this power wire got disconnected from the power source, but since it split into a fork, it acted like the original fuse link. I realized I no longer needed it, as the problem seemed to resolve itself. I replaced the fuse and rode it for a few years more with no issues until I sold the ski. I forgot if I was getting beeps when I put the key on or not, but I want to say no.