Mr. cthoops and I are electrical
newbies but learning
bit by bit. This is our first boat with two batteries and a Marinco switch. The batteries are both AGM
85 amp, and the switch is your standard 1/2/both/off Guest.
On the back of the battery
selector switch we have three cables
going from the left post (the one directly behind "2" on the front) - a skinny red one connected to a Blue Sea on/off switch (which appears to control the VHF
and a cigarette lighter), a fat red one leading to the alternator
, and a skinny red one leading to the ignition switch. The center/upper post (the one directly behind "both") has a fat red cable connected to the positive on our #1 battery
. The post on the right (the one directly "1") has a fat red cable leading to the positive on our #2 battery. See picture below.
Shouldn't the wire leading to the alternator
be hooked up to the center post, which I believe is the common post (since it is the one directly behind "Both")? That way the alternator would charge both batteries? Is there supposed to be a positive and a negative coming from the alternator (we have a single-cylinder Yanmar
SB12 - original engine)? Also, to make it more intuitive, shouldn't the positives from battery #1 and #2 be connected to their corresponding posts on the switch (instead of the common and the post behind #1, respectively)?
As for the batteries, they have the following wires: Battery 1 + is the cable to the Guest switch and a Marinco battery direct connect which has the positive for our bilge pump
and our Nature's Head
fan; Battery 1 negative has a cable leading to the negative on Battery 2, and the Marinco battery direct connect with the negatives for our bilge pump
and our Nature's Head
Battery 2 + is the cable to the Guest Switch, and Battery 2 negative has 4 cables/wires: a cable from the Battery 1 negative, a wire leading to the negative on a bus bar, a wire leading to the Blue Sea switch, and a cable leading to the engine
- I believe that's the ground wire, although it's been a while since I've looked at it. Maybe it's the negative from the alternator?
As best as I can tell from reading and researching, if the negative running from B1 to B2 is connecting the ground wire (instead of the negative from the alternator), there really should be two cables
running from the ground to each negative post instead. Correct?
Finally, if I'm right about the above and we make those changes, and then run a battery cable between the positives on Battery 1 and battery 2, and another cable between the negatives on Battery 1 and battery 2, then they'll be wired in parallel. Then when we hook up the solar
panel, we can run the positive from the controller to the positive on battery 1 and the controller negative to the negative on battery 2, and the solar
panel will charge both batteries, correct?
Any help would be extremely appreciated. Thank you!