there s no isolator od any thing. the battery is a D-4 it's a deep cycel and it about 75 lbs. each, i charge them once a week because i do not yet have an upgraded charging system, it runing 6 kicker sx1250.1 and 1 sx900.4 with 12 15" comp vr's.
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Iam a car stereo installer. if you have stereo questions you can Email me willthisfitinyrmouth@hotmail.com
or get me on aol instant messenger dirtybird097