Well during lunch today, I tried starting the truck while in drive; nothing happened. So that must rule out the TRS.

After work, I took a trip to AutoZone and got them to check the battery with their testing device. It was reading a 66% charge and outputting only 100 amps. Definitely time to change it; the old battery was from October 2008! I got a replacement and now the truck fires up with no issues.

Thanks for all the help.

 

Glad to hear you got this figured out. Thank you for following up with what you found!

-Rod