Did you know?The GMT900 Chevy Avalanche was introduced at the Chicago Auto Show in February 2006.
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Don't disconnect the battery, buy a Ctec battery tender or a Battery Tender Plus and hook it up. I've currently got a Ctec and like it better than the Battery Tender Plus I had and that someone else thought they needed worse than me.Regarding the original question, yes you disconnect the negative terminal.
Where do i find ctec?
Google
I bought mine on Amazon.com. I checked for highly-rated sellers with a cheap price. I bought the "800" model.The Ctec is a "smarter" unit than the battery tender as it has more modes - it has a special mode for agm batteries like the Optimas.
Ugth, i was hoping i could find this at autozone or so. I too use Optima battery.