water in oil-like coffee very dark,my 1999 gs 249

Deka Marine Master group 27 dual purpose batteries. If you are using starting batteries, the dual purpose batteries which are kind of a hybrid between a starting and a true deep cycle hold up better than starting batteries to loads like bilge pumps, etc. When you use the boat you can leave it on both but if you leave the boat after using with the switch on both, the weaker batt will pull current out of the stronger one. You MIGHT get better results by doing this, just alternate battery use by trip, because that way your alt only has to re-charge one battery at a time, otherwise it has to charge both simultaneously. I have always run the boat this way, I leave it on the one I used (have to leave batt switch on when its on the mooring because of how the bilge pump was wired from the factory) for that trip. Then when I use the boat next time, flip the switch to the other batt. Maybe that's what made them last as long as they have. I leave mine in the boat over the winter and charge em when I close it up, then on a nice crisp winter day when its sunny I open up the cover and charge em up.

what is your charging voltage when running, it should be approx. 14.2 V....

https://www.dropbox.com/s/25070o8154sswaq/'88 FW instrument panel.jpg?dl=0

but check at the batt with a digital voltmeter more accurate than the dash gauge...

I'm using this battery capacity tester with a Schumacher smart charger...this is a spare batt for my '07 Jeep:

https://www.dropbox.com/s/g8aimr1zge76yj4/battery capacity tester.MOV?dl=0
 
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