We just pulled our boat out to clean it out for the season and going to take it out tomorrow. We hooked up the hose like usual to start it up and make sure that everything was working correctly. We hooked a battery pack up to it since the battery was dead from not being used for quite awhile. The boat started right up and everything was running fine. As soon as we unhooked the cables from the battery terminals the oil light came on and the alert horn started. I checked the manual and first thing it said was to check for overheating but we let it run and it didn't seem like anything was heating up. I checked all the wires I could and nothing seemed loose. There is oil in both tanks, and we even tried changing the fuse. Nothing is working. Please help!!