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LEt's do this: get a voltage measurement on each battery separately. Completely disconnect them - both batteries, both + & - terminals - and measure the voltage between the posts. You are measuring each battery separately. No connection between them, no connection to the truck. Please...

Yep, that's correct. That should be 12v. Those batteries are in series. Those are lousy terminals, and you have unprotected hot leads laying across grounded battery hold-down, but the wiring is correct as far as which terminal is connected where. So you have 24v at the junction block...

Incorrect terminology enhances confusion and increases mistakes. That "little bus bar" is a junction block. The bus bars are on the passenger side of the engine compartment, where the batteries are located.

Nope. You made a mistake somewhere. Post some pics of where you connected that you think should be 12v.