thanks to all... I am running an optima yellow top battery, and I am reading from gauge on cluster and directly from battery... and they both are pretty consistent on the numbers...
I am running a 400 watts amp for subwofer, a 350 watts amp for the speakers (which , pair of hella 700ff lights that I don't turn on just once in a while, a couple of 4 inch fog lights, just like the ones from the wrangler (don't remember wattage but around 100 watts), and the spec-d tuning headlights which have H7 light bulbs at 55 watts each, thats 110 watts total... leds, amber turn lights, I am really not running that excessive accesories.
Electric fans, the left is the OEM from the 2000 cherokee, and the one that replaced the clutch fan is a Zirgo electric fan (ZFB16S - 16" Zirgo 3000 fCFM High Performance Blu Cooling Fan), both running on relays with 10 gauge wire and everything, professionally installed.
btw, I think I have the 117 amp alternator from the 2000 jeep cherokee xj donor, at least thats the one I remember putting with the exchange of parts.
I am going to try the upgrading of the cables and see what is happening.
thanks