I dont even have a stereo, and I wouldnt say an 87 XJ is modern lol.

I know the holes are factory, whats the diameter of zero gauge?

Dang, I was about to go look, but I forgot I rode today, no XJ at work! :/

 

Still modern enough. My 90 has 0 holes that aren't filled.

 

Yeah, your right. You win. There are absolutely ZERO holes to bea found and used under the dash. You MUST cut new ones for anything that needs to be run through the firewall.

 

Aww... Sorry ok there is one by the heater box. It's got a grommet and vacuum lines running through it with space for 10 gauge wire. I'm just saying. I've been all over the firewall in my 90 and its sealed besides that little space by the vacuum lines. Maybe there are in yours (wiring is a little different) but not in mine.

 

I just drilled a hole under the heater core to put mine thru

 

may be a spot where a master cylinder would go...was one when I converted auto to manual...a,lil tab popped out and voila, hole, on 2000 tho.

 

also have a hole for my hood cable, rubber can be cut and enlarged...

 

I can second what Gee is saying here. On my 89' there is a hole sort of underneath the coolant tank near the purge tank... It ran it right through to the top of the passenger side footwell. It is plenty big enough for 0 gauge;however, i can't confirm whether or not the wire will fit under the trim to go to the back.

 

Hopefully you used a gromet.

 

I have 2 4 gauge wires, and about 8-9 14 gauge wires along with a coax for CB antenna going through the grommit that the wiring harness goes through... Just take a knife and make a new hole in it, will fit all the wires you need.

Oh and BTW, that grommit that the harness goes through is RUBBER so it stretches pretty easily.. I ran my original 2 gauge through with the harness and could have easily fit 0 gauge.

 

Huh. I don't have that on my 90. They changed the wiring in 90 a little so Idk.

 

my 95 has it as well, i know because im missing the grommet

 

That's the hole I was talking about earlier with hvac vacuum lines going through. With the grommet intact it is very difficult to fit 8 gauge or larger wire through it. 0 gauge no freakin way. Most primary battery cables are 0 or 2 gauge... Think that will fit?

 

Is this the hole everyone is talking about?

 

Thats not the same hole. The grommit im speaking of has ONLY the stock wiring harness running though it. And i DID put 2 gauge through mine, as i said its made of rubber.. if you want it to stretch it'll stretch.