Battery issues?

Hey good people, this year alone I've replaced the AC compressor, AC amplifier and rebuilt the transmission...I still have to replace the fuel sender unit, the leaking 3rd brake light unit and a side mirror that has burnt out (the heating element has turned the tint in the mirror) now I have another issue that is perplexing me...

The battery light started to randomly stay on, I thought it was the battery starting to go so I had it checked out and the battery is still good, now the amps are fluctuating on the dash with the tire pressure sensor coming on and off when it does and to top it all off I've caught the speedometer dropping to zero when doing about 45mph, I've only seen the speedometer thing once...

Anyone else experience these issues? 2007 Tundra limited 4.7 with 122k miles

 

This seems like an unusually long list of problems, especially for a Toyota with so few miles.
If I might ask, what modifications have you done and when were they done?
The answer to this may provide a clue to the solution.

 

I've done no modifications...well...Edwards transmission updated the flash transmission software when they rebuilt it but that's it.

 

Did you check the alternator?

 

Sounds like the alt goin if all dash lights coming on

 

I'll check it out and let you know