Ford Excursion :: 2000 V10 - Battery Light Flashes Randomly After Rebuild / Upgrade

So I have a 2000 6.8l V10 that I recently swapped the engine on (reman). While I was doing that, I decide to do some LED upgrades. I swapped out the turn signals, side marker lights, and headlights with LEDs. I added some LED fog lights, and I have a Rigid light bar.

I replaced pretty much everything on attached to the engine aside from the alternator (it didn't give me any problems, so I figured it was good).

When the truck is running with the lights off, there are 6 LED strips running as DRLs, when the lights are switched on, the side marker, turn signal and headlights turn on. When I switch to high beams, my fogs turn on. The light bar is on its own switch.

During the day with the headlights off, I dont notice the battery/charging system indicator light turn on at all. At night, when I flip the headlights on, I've noticed that it sporadically and randomly flash. The flashing indicator light does not appear to be associated with bumps or anything.

It does not seem to matter if I have just the DRL/low beams on, DRL/high beams+fogs, or DRL/high beams+fogs + light bar on. The indicator light comes and goes with the same random consistency regardless of how much power I am sucking from the alternator/battery. The RPM's of the engine also appear to have no effect on when/how often the indicator light comes on...

I drove for over an hour last night, and the voltage gauge never changed, so the battery does not *seem* to be draining (~1 year old Optima yellow). I added an extra ground wire going from the battery to the engine about a year ago (long before this LED upgrade) to ensure a good ground, so I dont *think* the wires are the issue. Is my alternator suddenly going bad? Any higher output ones I could replace it with? Is it a simple fix that does not require a new alternator?

Here are some pics of the lights:

(This was before the fog light install)

These lights only come on when the truck is in reverse: