I installed a shurpower 1315 isolator. It is so simple, I don't know how I
messed it up.

I hooked up main battery + to one terminal, Aux batter + to the other
terminal.  I left the 3 little switch prongs alone, as I don't need it
manually switchable, just want it to intelligently charge the aux battery.

After a few days, my aux battery was dead and I realized something wasn't
working.  I checked voltage at the terminal from the main battery, about
12.5 not running, around 14 running. A little hard to get it exact on a 50
volt scale analog meter.  Only 5 volts at the other terminal, running or
not.  I realized the main and aux battery + wires were connected to the
wrong terminals, so I reversed them.  Same result immediately after.  I
would have expected to see 13+ volts going into the dead battery.  Is that
right?

There isn't a ground terminal on the isolator, so I just put a small screw
into it screwing into the battery box metal and thought that would be
sufficient.

Could reversing the terminals hurt the isolator?  Should I be getting
charging level voltage when the battery you are charging into is dead?

Thanks for anyone's help.

Dave in Denver
Electrically challenged

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