haha and this is only my 2nd post! yes the alternator is necessary with the motor running, but if you are winching out of a 4 ft puddle with your lights on, the deep cycle helps.

matt, you sure you have good connections everywhere? grounds and such?

Yea its more of me not driving the car and when I do the EWP draws more than the alt can put back( its a lot of idling etc).

what do you idle at? you don't have a "power" pulley on the alt right? i would check the voltage its putting out first before chucking a battery at it

Maybe 600. And no, stock pulleys. It puts out like 13.4 and w/o it on the batter is like 12.

Back on topic, what is good for a car that doesn't run that often but has a pretty heavy load on it?

Gel cell batteries have a long shelf life, and have a the ability to go longer without a charge then conventional batteries.

So what did you go with red or yellow. I use red in both my f bodies They come with a 3year free replacement and seven year warranty.

Red Top. The only noticeable difference I saw was an easy start up in cold weather

I havent gotten anything, yet. I have been busy/lazy and the car needs a tire solution and it is cold and dirty and I am lazy.
Ill go with another Redtop once I am ready.