I have an SD187 and the engine and the tilt work fine. However, the power coming into the electrical panel is very weak. If everything is turned off, the voltage reads nearly 12 volts. However, as soon as I turn anything on, the voltage drops. I can sometimes power the radio, but if you turn on any lights, the voltage drops down to nearly zero. I am measuring the panel voltage relative to the battery ground. I already checked the fuse holder that comes out of the dual battery switch. This looked very corroded, but I measured the voltage just after the fuse and it read normal even with accessories turned on. Prior to the power failing, the boat took on a lot of water and all of the wiring in the back of the boat got submerged (fresh water). A few weeks after this happened is when the problems started occurring. The fuse to the automatic bilge pump blew, which is what caused the boat to take on water.