Marine Electronics Forum - Battery question ?

THE HULL TRUTH is the world's largest FREE network for the discussion of Boating & Fishing. Whether you're researching a new boat, or are a seasoned Captain, you'll find The Hull Truth Boating & Fishing Message Forum contains a wealth of information from Boaters and Sportfishermen around the world.

View Full Version : Battery question ?

06-06-2007, 06:49 PM
Hey I sound like a newbie but I'll ask anyway. My Mako is has three batteries in it. I have three switches a small switch under the console and two in cabinet under the sink. They read 1,2 or both. My question is when do you run them on both and does this charge the system on the move or are you suppose to switch to both when you are sitting still and running the elect so as not to run the batteries down. I believe the small switch under the console is for electronics wired direct to the third battery.If you have a Mako 253 with the same set up let me know. Thanks ;?

06-06-2007, 09:08 PM
What year?

06-06-2007, 09:52 PM
No Off position ?

I'll assume you have twins

If wired correctly, each engine will have it's own batt & switch

You can emergency start an engine by paralleling with the other batt by putting the switch on Both

If a batt is shorted, you can use the other engine's batt by putting the switch on 2

Not sure how the 3rd batt is connected. It is probably connected to one of the starting batts thru it's switch which means it has to be in the Both position to charge.

You may want to use an ACR to isolate & charge the 3rd batt

06-06-2007, 10:06 PM
When running, you want the switches on "Both" to charge all of the batteries. As Elusive suggests an automatic charging relay will allow you to keep the batteries isolated when not running, and as soon as the voiltage in the starting battery/batteries, come up to a set voltage-(usually 13.7 volts) then all of the batteries will charge. You generally want to have the starting battery/batteries turned off when not running. Find out which battery is 1 or two, and draw out a schmetic of the batteries and switches.

06-07-2007, 06:10 AM
Makosteve the year is 2001. I do have twins and thanks for the help fellows I was told not to run in the 2 position. Now I know.Each motor does have it's own battery the smalll switch under console is just wired to the battery that is not connected to the engines. I believe it for the electronics my concern was just keeping the batteries charged up when out for a full day of fishing.

Search Engine Friendly URLs by vBSEO 3.2.0