Sometimes you can power the hatch by powering the fuse bus under the helm if you have it located there. On my 2003 340 the fuses for several of the accessories are there and another one is inside the hatch. If the batteries are totally dead, this m...
check for vapor lock, if you have the cool fuel pump module on the side of the motor a raw water line cools the fuel. This happened on my 496's on a 340 sundancer. Took 10 minutes to fix and clear the line.