I have a 316 with an 18HP Onan and recently started to blow a 30 amp fuse that is hacked into a pink wire that comes from the harness and connects to the key switch. This would happen after after running for an hour or so. I would replace the fuse and it would run for another hour so then blow. I replaced the PTO switch and now it blows after a minute when the pTO is engaged. Before this happened I adjusted the air gap to .018 in. after learning that would fix my PTO that was getting hot and preventing me from turning it on after turning off while mowing. I got the gaps set and it worked great I could turn the PTO off and back on after mowing, but that's when the fuse started blowing. I'm not even sure if that red wire with the fuse on it that is spliced into the pink wire is even supposed to be there. I'm thinking about changing the key switch out next. The battery is over 6 years old too and I'm wondering if that could be causing the issue. If there is a short would two wires need to be exposed and touching each other or just touching the frame? I followed the pink wire to the key switch. Does anyone know why there are so many wires coming out of that switch? Why would the PTO be attached to it?
Thanks for any help.