Another Trans Failsafe Program Fail... Help!!!

[Roadieschuler]

A few weeks ago I got the dreaded Trans Failsafe message on my '03 4.4. My battery was starting to get grumpy after the X sat for a couple weeks, so I replaced it with one from autozone. The Trans Failsafe program still shows up, but only when the X reaches full operating temp. It shifts perfectly fine up until the program kicks on. It then shifts into 4th and stays there. The Trans fluid and filter were changed by the dealer when I bought the X 10k miles ago. The check engine light also came on, but no other dash lights. The codes I got were:
P0751-poor electrical connection-failed shift solenoid.
P0741-poor electrical connection-low transmission fluid level-failed TCC solenoid.
From what I've read on the outpost, I need to check if the alternator is good first. Does anyone know the procedure for getting alternator voltage on the dash?
I'm also going to try to test it with a DMM tomorrow. Does anyone have any other suggestions I should look into?
Thanx,
Nick