http://www.sonicelectronix.com/item_...-40KX8001.html
If this is your amp, it says that 4 gauge is recommended for power and ground. It would be the best bet to run a wire from the front battery to the amp with fuses 12" or less from the main battery and another fuse 12" or less away from the amp (if there aren't any onboard fuses on the amp itself). Mainly because of the reason I mentioned above with the factory wire not meeting this 4 gauge requirement.
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2002 Alero GL 2.2L Eco-tec w/ 87,800km 
New System in Progress...Mids/Tweets: 2 Skar SPX component sets powered by a Skar 85.4. Subs: Hybrid 15" DD/AA, Amp: Skar SK3500, 2 runs (power and ground) of Knu OFC 0 gauge, XS d3400 up front, 2 Deka g31s in the trunk...more to come
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