Trunk Mounted Battery
Pics coming soon...
So, you've put in an intake and you want to mount your battery in the trunk.
Stuff you need:

  
17 feet 0-4 gauge wire, 3 feet 0-4 gauge wire: (different colors)
    2 battery terminal connectors (negative and positive terminals are different sizes on some cars so get the right ones)
    Battery Box w/all the tie down equipement (I bought a Mr.Gasket batter box that came with all the screws and straps and stuff)
    1 0-4 gauge (depending which size wire you bought) ring terminal 
    Obvious tools (you know screw driver, socket set, crimper, stripper, etc...)

Obviously, first remove your battery from the engine compartment. Place the battery on a piece of wood or cardboard instead of on the pavement/cement. Next, find a place in the firewall that you can pass wires (if you have an amplifier for your sub/system, find the place that their wires go through). On my car ('88 Lude), I have a factory hole in the fire wall behind the front right fender. I partially removed the plastic covering the wheel well. Stock wires are often run out of the side of the engine compartment, into the wheel well and then into the interior of the car just to the right (sitting in the passenger seat) of the glovebox. Basically, I put my 18 feet of fat power wire through those holes. If there is no hole in the firewall that is reasonably accessable, then you may have to drill one yourself. This isn't very hard, just remeber that there could be important components behind the firewall where you're drilling, so check before you drill. Once, you have your fatty through the firewall, run it under the carpet along one side of the car to your trunk. ***If you have a sound system and your amplifier is getting its signal from RCA's from the head unit, have your fatty power wire running on the opposite side of the car as it could cause a whine in your speakers if they are close together.*** Once you have your long power wire going from the engine bay to the trunk, connect it at one end to the original positive (+) battery terminal wires (there should be 2, one powering the car, and the other powering the starter). Buying giant sized butt connector would be one way of connecting them, or soldering them together and finding a piece of rubber hose that you can slide on tightly would be another way. Either way, make sure that the connection is protected from water and from grounding out on the metal of the car. Once that is done, go to the trunk. Find a good place to ground your battery. It could be a screw in the metal somewhere in the trunk. Once you found a place, attach the 3 foot 0-4 gauge ground wire to the big ring terminal you bought and use the screw you found int he trunk to attach the wire to the metal. On the other end, attach the negative (-) terminal connector you bought. This is now a ground for your battery. Now, still at the trunk, find a place where your battery box can sit. Once you find a place, use the screws and clamps and such that came with the kit to secure the battery box to the inside of the trunk. it is important that it doesn't move. Believe me, you do not want battery acid spilling inside your trunk, ruining your carpeting, metal and battery. Once your box is secured, see how much power (+) wire is slack and cut it to an appropriate length (meaning not too long, but even worse NOT TOO SHORT). The wire should have much slack. Attach your positive (+) terminal connector to the end of the power wire. The end is near. Pick up your battery from the wood you put it on (you did put it on wood, right?), and put it in your battery box. Make sure everything is secure. Now attach the power (+) fatty long-ass from wire to the positive (+) terminal of the battery. Then, attach the negative (-) ground wire terminal connector to your negative (-) terminal of the battery. If it sparked, either your car alarm is going crazy, and/or your dome/trunk light just turned on. Sparking isn't bad, it just means that there are somethings demanding power from the battery. Put the lid on your battery and voila!

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