? screen will not come on. Worked last fall and was stored disconnected and removed from my boat in my heated garage. I have 12 volt power on the (2) female contacts in the plug that goes directly into the back of the unit. I have 12 volts on connectors at 5 O\'clock and 7 O\'clock. Any suggestions? There does not appear to be any corrosion. no modifications where ever done in the wiring of the boat. I have checked with a VOM to verify the fuse is good (continuity) and power on both sides of the fuse.