The forward bilge pump in my 2009 278 was wired incorrectly from new. Eventually enough rain water accumulated there to submerge a multi pin connector ( low down, starboard side, to the rear of the forward bilge). and electrolysis occurred; corroding away some connectors and allowing other to get power when they shouldn't have ( forward bilge pump always running, but very slow and cockpits lights always on. albeit at low intensity). Battery drainage and failure, multiple new batteries fitted by the dealer before I bought it
I rewired the bilge pump properly. ( fresh water pump was also plumbed in backwards !).
I chopped off the multi connector, used adhesive lined heat shrink crimps / tinned wire to extend the harness to the port side and used 3 or 4 sets of waterproof multiple pin connectors there under the upper step, well above any possibly water level in normal use.
It's been fine ever since.
I recommend you look at that multi pin connector; 12 pin if I remember correctly. I can't check on the wiring diagram in the owners manual as it's on the boat 100 miles away ! For mine in any case, the wiring diagram is for earlier years, up to ca 2007 or thereabouts; certain things in the wiring changed on later models. Some obvious, some less so. As a consequence, for mine the wiring schematics only give hints. No wiring schematics were made available for 2009 models even to dealers !
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