not necessarily, from memory they were originally designed for marine applications hence the negative isolating (got me stuffed why) but can be wired both ways.
there is a series of installation diagrams available over at the cole hersee site itself.
here is a positive wiring diagram - note marine referrences
http://continuouswave.com/whaler/ref...alBattery.html
I have included the info / install sheet supplied by Cole-Hersee itself



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