Electrical issues (battery light)

So my truck is 04 tundra v8. Well maintained (far as major issues) former company work truck, I am second owner father owned before me. 207,000 miles. I have a battery light that comes on when idling. I think it could be an alternator issue. It comes on intermittently primarily when idling for a few minutes or driving at low speeds for a few minutes (no issues or lights driving at higher speeds 50-60 rpm under 2k likely around 1200) just replaced battery. Window driver slow sometimes others nearly normal. Last battery had very slight swelling under year old. Tried a few things but no one seems to have my issues specifically. Thank you.

 

Give us pics of the terminals. Are they tight? Have you checked for corrosion inside the cables?

Here’s why I ask: https://www.tundras.com/threads/1st-gen-psa-clean-your-battery-terminals-you-lazy-sods.131635/

but more importantly, when was the timing belt last done? It’s due every 9yr/90k miles. That and plenty other new-owner info here: https://www.tundras.com/threads/so-you-wanna-buy-just-bought-a-1st-gen-tundra-eh.115928/

Welcome to the forum!