ONE MORE THING TO CHECK IS CRANKING AMPS IN BATTERY , HOT AND COLD SINCE YOU SAY DRAWS DOWN WHILE SITTING FOR A WHILE AND YOU TESTED CIRCUITS AND CANT LOCATE -MAY HAVE A CELL ON ITS WAY OUT-------IT COULD STILL HAVE GREAT VOLTAGE BUT NO AMPERAGE AND A HOT ENGINE TAKES MORE AMPS TO TURN OVER HOPE IT HELPS