Does anyone recognize this device? There is nothing printed on it - but I did not detach it to look at the back side.
Is it a battery combiner of some sort?
The Guest 20 amp battery charger (which I assume is original to the boat?) was connected to it. The leads run to the main battery switch. I have not traced alternator lead to confirm if it is connected directly to this device.
Given the size of the heat-sink. It might be a battery isolator.
It is most likely a diode type battery isolator. However, the pair of wires off of each of the 3 upper terminals makes no sense. How many batteries are on the boat? How many charging sources are on the boat?
John
1988 Hull 728
Otra Vez
WT this is a continuation of your earlier Xantrex charger qustion. You could have left it as a continuing thread there, so here's the link to that topic: http://c34.org/bbs/index.php/topic,5010.0.html
That looks like a battery isolator and should be, along with your old charger, one of the first things to remove from your electrical system. Isolators eat voltage, which is what, when charging, your batteries need in addition to current.
Throw it out, and study the electrical articles referenced in your earlier topic. Before you go much further, unless you know boat electrical systems and what you are doing, you might want to draw up a wiring diagram.