Hello, I recently bought my 96 XJ in November 2019 for my first car. I LOVE it. But there is always something to spend my money on. I am having some difficulties so I looked them up and found this site and here we go with my build.

I have just recently identified a valve cover gasket leak, and my headlights won't turn on with my subwoofers connected. Any help?
It is a green 1996 XJ with 251000 miles. It is a 2wd but the previous owner was in the middle of a 4wd conversion. I plan on completing the conversion in the summer as I am in High School at the moment and I daily drive it.

Upgrades so far:
Corbeau GTS II grey cloth seats driver and passenger - not yet installed
2 JBL GX1200 12" Subwoofers in a Metra Enclosure with a Kenwood KAC-511 1000W AMP
Joying 8.8" Head Unit and generic back-up camera - not yet installed
BF Goodrich A/T 31x10.5x15 Tires on American Racing R15 Wheels in Chrome
Spidertrax wheel spacers on all wheels - 1.5"
The Cure - not yet installed

I am planning on a light bar and a high lift jack and cutting the fenders and new bumpers. I also want to put a 6.5" RC lift and 1-ton steering when I do the 4wd swap. Feedback?