Where did you run your ground on a rear mounted battery? Anywhere on the pan good?

 

Any clean chassis ground will work. I used the rear seat bracket for mine (seats were deleted a long time ago).

If you plan on passing NHRA Tech for dragstrips you will also need a Moroso sealed box (currently the only box certified for use in hatchbacks).

 

Or a sealed Battery, right?


Anf on the topic of NHRA, does the cut off switch need to goe on the positive or negative cable?

 

NHRA currently does not see dry cell batteries as safe, so they do require a sealed box.

http://www.nhra.com/contacts/tech_faq.html

"I have a street car that I occasionally run at the strip. I've relocated the battery to the rear. What else do I need?
Any car with a relocated battery must be equipped with a master electrical cutoff, capable of stopping all electrical functions including ignition (must shut the engine off, as well as fuel pumps, etc.). The switch must be located on the rear of the vehicle, with the "off" position clearly marked. If the switch is of a "push / pull" type, then "push" must be the motion that shuts off the switch, and plastic or "keyed" typed switches are prohibited. Also, the battery must be completely sealed from the driver and/or driver compartment. This means a metal bulkhead must separate the trunk from the driver compartment, or the battery must be located in a sealed, metal box constructed of minimum .024 inch steel or .032 inch aluminum, or in an NHRA accepted plastic box. In cars with a conventional trunk, metal can simply be installed behind the rear seat and under the package tray to effectively seal the battery off from the driver. In a hatchback type vehicle the battery box is usually the easiest solution, since the alternative is to fabricate a bulkhead which seals to the hatch when closed. At present, Moroso is the only company which offers an NHRA accepted plastic battery box, part number 74050.

But I drive on the street. I don't want a big cut off switch hanging on the back.
This solution takes a little work, but it solves the problem. Install the master cutoff inside the vehicle, positioned "sideways" so that the toggle moves forward and back. Drill a hole in the toggle handle, and attach a steel rod that will run out the back of the car, through a hole drilled completely through one tail light assembly. Have a spare tail light assembly on hand, so when you come home from the drags, you remove the rod and put the cherry tail light back in for street cruising. Next time you plan on going to the drag strip, swap lights and reinstall the rod. Since the drilled light is for the strip only, you can also have it marked "PUSH OFF" in big letters so the Tech Inspectors will think you're cool."

 

Sorry I forgot to answer the 2nd question... It should be on the positive side.

 

FWIW, Jegs has a sealed plastic battery box that they say is NHRA legal.