Okay guys. the 12/24 system has thrown me off. I have a 92 model boat that has the 12/24 motor guide brute model no 750 on it. Well, it's not working at all when I switch to 24. Works fine on 12. I've replaced the switch. Checked all three holes for the jack and all have juice. Both batteries have new breakers. Where else could this problem be? I need to rewire the whole front of the boat, but if I could get trolling on 24 I can hold off. Wind is getting bad on the lake and I need some extra power. Thanks fellas. Plus, if anyone can tell me the how the whole 12/24 system works and how it's wired. Maybe this won't be a problem anymore.