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Adding 2nd battery

mtomison

Full Member
Joined
Jul 5, 2011
Messages
16
I am adding a second battery. Do I need a second alternator? How about setting up a float charging system to plug into ac power supply?
 
I ran a dual setup in my 02. The second one ran all my AV systems. I did have a bigger alternator installed as well. Note: You will need a relay that keeps the two from canceling each other out when the car is off. I think it was called painless

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index.php
 
I ran a dual setup in my 02. The second one ran all my AV systems. I did have a bigger alternator installed as well. Note: You will need a relay that keeps the two from canceling each other out when the car is off. I think it was called painless

index.php

index.php
I upgraded alt from 105 to 140. Thanks for the diagram.
 
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