I know this isn't specifically a fishing/hunting topic but I dont know where else to put this. For some reason, the batteries on my boat seem to drain between uses. There are three batteries on the boat; one for the starboard engine starter, one for the port engine starter and one for housekeeping. The battery for the port engine drains rapidly (less than a day) even if it is brand new and fully charged when installed. I even tried shutting off the battery switch when not using the stupid thing. I checked all the wiring and it all seems to be ok. I have heard that the starter solenoid could be the cause but have not had the chance to replace that yet. Does anyone have any experience with this or have any suggestions?