I just bought a 1994 17' Nitro with a 1995 Mercury 115 hp outboard s/n 0G142817. Today, the first time out, it was stuttering at trolling speed. (has old gas in it from sitting from prev. owner) revved up the motor for a second to blow it out and started getting the beeping. Figure that is for overheating but the water is running good, and is not hot. Let it sit several hours, turn on the key, and still get the beep. Is this a loose wire? Should I disconnect this and put a gauge in? Where is the most likely place to look for a loose wire? Any help is appreciated, this is the only boat I ever owned that shows a promise to run.