the battery should be located on the right rear corner of the trunk. I used a one piece, solid copper wire for the positive battery cable, and the cable that ties into the master electrical cut off switch, bought at a welding supply shop, as the cheap positive cable that they give you in most of the trunk battery relocating kits will NOT work very well, as they are under sized for the length of cable that is needed. I also used a couple of the quick disconnect battery terminals that were matched to the larger sized copper welding cable . As far as routing the wire from the trunk, up to the starter, I ran it on the right side of the trunk, over the right side wheel tub and up to the front of the trunk compartment, by where the metal X brace is located for the rear seat, then over to the left side of the trunk compartment. From there I ran the wire inside the factory wiring tunnel, that runs down the drivers side floor pan, along with the factory wiring harmess, and then up to the front firewall, where I ran it through a factory firewall body plug and then down to the starter. Below is a picture of how I mounted the battery and battery tray in my 66 Coronet. If you are going to race the car, make sure that you follow the NHRA rules and regs like I did, concerning how you mount the battery and battery tray or box.You will also need to replace the factory cardboard trunk divider, with an NHRA approved metal or aluminum divider and you will also have to install an NHRA approved electric cut off switch at the rear of your car. Last but not least, I would recommend the use of an Optima battery, as they will not leak and or corrode your trunk's floor pan.
Richard
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When I die, I'm taking my 66 Coronet 500 WITH me! God member on old forum with 1276 posts
The banker has it dead on. You have to use 3/8" bolts for the battery tray and 3/8" j bolts for the hold downs to meet NHRA. I did it very similar except that after the Master Switch, I ran it behind the finish panel and then around the drivers wheel tub and down below the x-brace, under the rear seat and into the channel. I replaced the grommet hole he speaks of with a 2004 Jeep Wranger Grommet which has a double seal and is the exact same oval size.
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263 Posts on old board. Member since March 2003. "Where the hell do i go to tell the world my dog died or my gf is in jail or my penguin ran away!" -njsuperbees
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the battery should be located on the right rear corner of the trunk. I used a one piece, solid copper wire for the positive battery cable, and the cable that ties into the master electrical cut off switch, bought at a welding supply shop, as the cheap positive cable that they give you in most of the trunk battery relocating kits will NOT work very well, as they are under sized for the length of cable that is needed. I also used a couple of the quick disconnect battery terminals that were matched to the larger sized copper welding cable . As far as routing the wire from the trunk, up to the starter, I ran it on the right side of the trunk, over the right side wheel tub and up to the front of the trunk compartment, by where the metal X brace is located for the rear seat, then over to the left side of the trunk compartment. From there I ran the wire inside the factory wiring tunnel, that runs down the drivers side floor pan, along with the factory wiring harmess, and then up to the front firewall, where I ran it through a factory firewall body plug and then down to the starter. Below is a picture of how I mounted the battery and battery tray in my 66 Coronet. If you are going to race the car, make sure that you follow the NHRA rules and regs like I did, concerning how you mount the battery and battery tray or box.You will also need to replace the factory cardboard trunk divider, with an NHRA approved metal or aluminum divider and you will also have to install an NHRA approved electric cut off switch at the rear of your car. Last but not least, I would recommend the use of an Optima battery, as they will not leak and or corrode your trunk's floor pan. 
