I have ran out o space in the engine bay so i am trunk mounting my battery to make space for the Digital 6. Where did you guys ground the negative cable back there?

If you get a chance to peel back the carpeting on the wall...you can gain access to the rear seatbelt bolt... It will be a rather large bolt that holds the roller to the body... I used this bolt to ground the system and reinstalled the seatbelt too... This hasnt failed me yet... Try this... If you need pics of this setup let me know and I'll try and get one for you...

Erich Tucker

Not sure how the 200sx is, but when I had my battey in the turnk, I grounded it to the bumper bolts. There are some rubber caps under the carpet, and when you take those out, there are some big bolts there.

Good luck.

I grounded it out on the bolt that hold the rear seat back to the body. Well see if this works:)