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  #1  
Old 07-11-2012, 09:51 PM
Kdmann64 Kdmann64 is offline
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Join Date: Jun 2012
Boat: 2003 Mastercraft x2
Location: Southeast
Posts: 68
how to wire two batteries two amps and switch.

My boat already had this set up in the boat, except one amp is not even grounded so i guess it does nothing. speakers are 4 on the tower 4 in the boat and one amp. i think im going to redo it all to make sure it works right. sooooo how do i do it? what should go where?
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  #2  
Old 07-12-2012, 12:20 AM
EarmarkMarine's Avatar
EarmarkMarine EarmarkMarine is offline
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Provided you have no other components such as an ACR/VSR then follow this simple scheme and avoid all potential conflicts or mistakes.
All grounds are common and both battery grounds must be interconnected.
Nothing but a bilge pump/float switch if applicable and possibly the memory should be battery direct. Otherwise, every positive including the starter/alternator feed, helm buss and ALL audio equipment should access power from the output post of the dual battery switch.

David
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Old 07-13-2012, 10:06 AM
Kdmann64 Kdmann64 is offline
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Join Date: Jun 2012
Boat: 2003 Mastercraft x2
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thanks for the response but i need this in wiring for idiots terms. im not following you yet....
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  #4  
Old 07-13-2012, 10:20 AM
MLA MLA is offline
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New battery GND gets hooked to original battery GND
Amp's GND gets hooked to new battery GND
Original battery B+ and everything else hooked there, except auto bilge B+, gets relocated to the switch "C" post
Amps B+ get hooked to switch "C" post
Switch post 1 gets connected to original battery B+ post
Auto Bilge stays on original battery B+
Switch post 2 gos to new battery B+

So, the only cable on the new battery B+ post is the cable going to the switch post 2. Same with the original battery, except the bilge auto B+ which is usually a brown wire with red stripe.
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