2001 Electricical Problem

Need some opinions on whats up with my XJ. When sitting still and idling, the lights, dash lights and cd player work fine. but whenever the jeep is in drive and going down the road, the cd player cuts on and off, and the dash lights, headlights and hella's all flicker with one another. Theres a short somewhere, but lord knows where. ive looked at the battery terminals and they are tight. does anyone have any ideas? alternator was checked and seems to be good. thanks.

This smells of a ground issue. Grounds can be the root cause of many electrical gremlins. Refreshing grounds is NEVER a bad idea!

You can't just check or look at these grounds. You must remove, scrape, clean until shiny the cable/wire ends and whatever they bolt to. The one on the back corner of the head, and where it attaches to the firewall. Scrape the paint from the firewall. Best to replace that woven cable with a #4 or #2 gauge cable. You can attach the one end to the intake manifold if you would like.

Next go over to the engine dipstick tube stud. Remove the nut and clean the wire ends and scrape the block until shiny at the stud. Reattach tightly.

If you are so inclined, add at least a #6 cable from the negative terminal of your battery to one of the bolts on your radiator support. Scrape the paint off first.