Marine Alternator Installation - Tips & Tricks - Marine How To Boat #1 Engine Room Temp = 162.4ºF. Boat #2 Engine Room Temp = 171.1ºF. Boat #3 Engine Room Temp = 132.5ºF. The alternator on boat #3 is going to have a much better chance of staying in a safe operating temp range than the Boat #1 or Boat #2. A cold and a hot rating are simply the short term outputs at 6000 RPM and the rated temp. If your Related searches for alternator wiring diagram marine mando marine alternator wiring diagramboat alternator wiringalternator charging circuit diagrammotorola marine alternator wiring diagrammando alternator wiring diagramforum marine alternator wiring diagrammercruiser alternator wiring diagramprestolite marine alternator wiring diagram