It's not needed but if you have two batteries you might as well get the switch otherwise you won't be able to use the two batteries independantly.
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Thread: When it rains, it pours
04-11-2012, 11:02 PM #11-2012 Supra 21v
Wetsounds Rev10's, Wetsounds SYN 4, Wetsounds XS-12, Alpine MRP-M500,
JL Audio JX360/4, Polk MM651 Interiors
-2008 Mobius LSV