WJ madness
 

Hello to all,
I am having a peculiar issue with a 2001 jeep grand cherokee. It has the 4.0l and it's a limited.

so yesterday I decided to change engine oil as well as spark plugs. I disconnected the battery, and I do this every time I switch off because I've got a parasitic draw that i havent got time to take csre of yet, Changed the oil and everything was fine, started it up, it ran great. Switched off and topped oil off as needed.

spark plugs were going fine, there are 2 ground wires on the coil rail thats bolted to the engine via a bracket, took those off, took off coil rail, changed them. I put everything BACK IN THE PLACE IT WAS BEFORE, and now it won't restart.

The is a fuse in the undergoes fuse box named PCM battery that keeps blowing. I started tracing wires and it supplied 12v to the PCM. After hours and hours of digging I realised that 2 of the ground wires on the coil rail is a PCM ground, left disconnected fuse is fine. When reconnected fuse pops. Checked voltage to PCM and it' fine at 12.6V BUT I also get the same battery voltage at the ground wire and as a result, the fuse pops.
I know I hav ranted a while but it' because I've been at it for quite a while so...what we got?

1. 10amp fuse #19 pops constantly
2. Ground wire on coil rail which is ground to PCM has battery voltage which I'm sure not supposed to be.

I also notice instrument panel lights on for a few secs when battery is reconnected and then shuts off. Fuel Guage also says empty which I'm sure isn't true.

HELP!! PLEASE!!