Trying to get an idea of what’s going on. So I replaced the battery (motorcraft) and alternator last year around the same time. Well as of about a week ago my battery light started intermittently coming on, as well as the red brake light and now abs light. Every now and then they will all 3 come on and my gauges (Speedo) will lose power as well. The only way my actual battery gauge has fluctuated is from its normal halfway position is to the 3/4 mark every so often.
The truck still runs great during all this and battery load tests out at 12.8.
Not sure what the issue is

 

Have your alternator tested.

I had 3 bad alternators before the 4th worked.

 

hey thanks for the suggestions. It turns out the bearing was going bad in my alternator causing the weird issues. Thanks for the help. Luckily it was still under warranty at Autozone

 

I had the same issue with mine -- all 3 squealed, 4th fixed it.