10-05-2012, 05:36 PM
You can, but it won't get much of a useful charge. You need to slow-charge ("trickle charge") a deep cycle battery to get the most from it. Somewhere between 2 and 10 amps going in (I usually charge at a 6 amp, declining rate, for my trolling motor batteries). Also, if the battery has been sitting around, especially without a charge in it, it might be toast anyway. I'd check the water level, test battery with a tester, and slow charge it before I ever trusted it on a motor or hooked it up to my vehicle. A quick-charge from your truck isn't going to tell you much.
[signature]
[signature]