02 XLS 4.0 - Wont start NO crank (video)

[DocRizk]

Bought this truck and drove it home, stopping at a few places and it started just fine. Got home and then it wouldn't start anymore.
Tested the battery and it was 13v+, with the lights all at full power and when turning the key to start the gauges would go crazy and I could hear clicking noises (relays?), but NO crank at all.
Checked the battery again the next day and it was under 12v so I thought maybe the battery was the issue after all, WRONG! Same **** except now in this video the gauges are static. I have also reset the fuel switch, and disabled/enabled the PATS alarm but no change. It has been raining so I haven't been able to get a meter on the starter to check voltage there. I also have not attempted to hand crank the engine.

Any ideas?? Starter, alarm, something else?

Checked the battery

 

[DocRizk]

disregard mi innability to check the small things first. corroded negative wire and a real crappy terminal piece

 

[D Hook]

Cheap fix! Thanks for posting the follow up.