This may seem basic, but did you check the main battery on/off switch located on the port side of the engine near the front(just above the oil filter). It is a big red switch that rotates clockwise or counter clockwise for on/off. It is ahead or all electrical load, so if it is off you will get NOTHING. The other thing to check is the kill switch teather below the throttle control near the depth guage. If that is activated, you will have electrical power, but the boat will not start.