[koates]

Check the big terminals on the starter switch, undo the nuts and make sure they have not overheated. Your battery cut out switch, check for the same as the starter switch or remove it and try the system. These switches vary in quality a great deal and cause problems. Check your ammeter terminals. Are they tight, not overheated. You are looking for a problem in the power distribution part of your wiring. Also earth cables are very important. Regards, Kevin.