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Discussion Starter #1
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Ok, so I've done a bunch of research on this, and I haven't found one definitive source on relocating your battery to the trunk. To remedy this, I've drawn up my own plans (combining a few I've found online) to figure out what I need to do to make the best battery relocation set up. I've made diagrams of two various wiring options trying to decide which is the proper way to go. I think Diagram 2 is what I'll probably go with. One thing I'm not sure about is where I need to put a fuse and the amp rating. Please let me know what you think of my plan and if I need to improve or revise anything. Or if I've forgotten anything. I want this to be a complete guide.

Why?
To answer the obvious question with a not so obvious answer, I'm relocating my battery to make room in the engine bay. I'll be mounting it in the lowest and most forward position in the spare tire well. Improving handling is not a reason for doing this but is one of the motivations however as to how I'm mounting the battery.



I have 3 goals in mind to try to make this the ultimate battery relocation set up.
Goals
1. Improve voltage/ minimize resistance
2. NHRA legal (requires externally accessible trunk mounted kill switch)
3. Protect from potential voltage spikes


To solve Goal 1, I'm using 1/0 gauge wire everywhere I can, with solid connectors and accessories which I'll be doing a careful and diligent job of soldering. I think Diagram 2 would be better for this, as there are less cables involved.

For #2, I'm going to mount a kill switch in the trunk. The switch must kill power from the battery and from the alternator to be NHRA-legal. Diagram 1 has two positive 1/0 gauge wires coming from the external NHRA-required Kill Switch in the trunk all the way to the engine bay. Diagram 2 has one 1/0 gauge wire coming out from the trunk and into the engine bay and instead uses a Alternator Kill Relay that will cut power from the alternator when the Kill Switch is pushed.

For Goal 3, I'll add fuses where needed. This is still a gray area for me as to where to put the fuse(s) and at what AMP.

I might do the battery protector and i might not. Its not a priority on my diagram.

Questions
So, if I understand it correctly.. one wire off the battery is the alternator wire, and the other one goes to the starter and THEN to the fuse box. Right? So those are the same two wires I'm extending into the trunk? If my diagrams are in any way incorrect please let me know!

Also, if I were to go with Diagram 1, is it okay to stick with the original wires coming off the Positive Battery Post, cut off the old terminals from the wires and attach them to 1/0 gauge wire? Or would going from 1/0 gauge down to smaller wire cause any problems or decrease in performance?

Looking to have a definitive solution to a trunk battery relocation. If I'm lacking in my plan or I've got something wrong, please let me know!

The diagram below was my first option and its pretty simple
 

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starter draws hundreds of amps

you will not be able to fuse it.

the size of fuses is determined by the wire carrying the current

the fuse is to protect wiring, nothing else.
 

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Discussion Starter #3
starter draws hundreds of amps

you will not be able to fuse it.

the size of fuses is determined by the wire carrying the current

the fuse is to protect wiring, nothing else.
Ok in that case were do i install the fuse, closer to battery or starter?
 
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