Question about a second battery - Chevy Impala SS Forum
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post #1 of 14 (permalink) Old 12-10-2006, 12:48 PM
Caddylack
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Okay I'm running my system off of two batteries... how do I connect the two batteries to one another? I already have a 4 gauge cable running from the trunk to the engine bay. I've been told that I need a fuse in between them. Some also say I should have an isolator, but is the isolator necessary? Thanks for the help.
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post #2 of 14 (permalink) Old 12-10-2006, 02:14 PM
PIMPALA-SS
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no need for an islolator.


connect the power wire to the positive side of each battery.

place a fuse within 18" or less of each positive terminal.

make the ground as short as possible.

done!
post #3 of 14 (permalink) Old 12-10-2006, 02:48 PM
glennSS
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Originally posted by PIMPALA--SS:
no need for an islolator.


connect the power wire to the positive side of each battery.

place a fuse within 18" or less of each positive terminal.

make the ground as short as possible.

done!


+1. The only need for an isolator is if you are going to play it for long periods of time, like at shows, with the car off. If you have an isolator and the battery goes dead, turn the key and start your motor.
 
post #4 of 14 (permalink) Old 12-10-2006, 04:27 PM
Caddylack
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So it is necessary to have two fuses? You can't just use one? This is how I have things set up right now:

post #5 of 14 (permalink) Old 12-10-2006, 04:52 PM
USAFCaprice
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yeah- you need 2 fuses. Its not about saving your equipment, its safety in case you get into a wreck. A 4 guage wire can tranfer a lot of current and start a fire easy. Its your car, but I'd spend the money on a fuse or a circuit breaker. IMO
post #6 of 14 (permalink) Old 12-10-2006, 05:32 PM
PIMPALA-SS
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yes, you need two fuses.


one at each battery, as close to the positive post as possible (less than 12" would be ideal). the reason for this, is because if there (like mentioned) was an accident, or the wire shorted out at the front of the car, the fuse at the front would pop, and keep the #1 battery frmo exploding, and the wire burning.

however, the battery in the rear of the car would still be attached to 15 or so feet of live wire, and it could easily cause a fire burning the entire length of the car, and or an explosion of a battery that sits directly on top of your fuel tank.
post #7 of 14 (permalink) Old 12-10-2006, 05:36 PM
PIMPALA-SS
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post #8 of 14 (permalink) Old 12-10-2006, 06:29 PM
Caddylack
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Okay... I have a second fuse sitting around so I'll connect that. What about the question in my other thread regarding RCA cables? Will that work, or do I need to buy a longer cable?
post #9 of 14 (permalink) Old 12-11-2006, 06:02 PM
the96pala
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That's pretty much how I have mine set up


250 alt - Optima - Fuse - isolator - battery - both amps


My fuse is about 6 inches from the battery, my grounds are no more than 12 inches from the batteries and the amps.
post #10 of 14 (permalink) Old 12-13-2006, 01:38 AM
cashmoneyspeed
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Any way to run 2 batteries like that with the stock alternator? Any other things that need to be done to put the 2nd battery in the trunk such as having the battery in a sealed box with a vent tube or just make sure its strapped down?
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