Bought a 2005 cobia 174 center console last year. used the boat a lot last year. The boat starts and runs good. Posted last year of trouble of motor running then shutting down to low RPM's. Read where Yamaha has a safety feature for overheating or low oil pressure. Would run at 2500 RMP's then pick back up. Well, came to the conclusion that is not my trouble. Have noticed in the past that everything on the boat is intermitting with power, (trim, radio, lights, bilge pump, gauges numbers breaking up, etc.) Not work then work, while on the water. Last time out fish finder showed low battery. New batteries. Recharged batteries, 13.5V. Started removing ground wires and cleaning terminals. Found one positive wire (thinking assy. wire) terminal green. Cleaned and replaced. Really do not think that is the only trouble. Have been trying to locate wiring diagram for the boat? Stator? Short? Limited knowledge of boat wiring troubleshooting without diagram. Neg. bus bar looks good. Could the brain box be my trouble or is there a way to check it? Thanks in advance for any HELP!