Originally Posted by tdeffert
I got 0 voltage across the terminals with the key off and got 12.65 on the battery. I haven't tried it with the key on or the car running yet
The Zero volt reading does not make sense to me.
Voltage is just an indicator for battery test. You have to subject the battery to heavy load to see if it is OK. Testing at the shop is free and is a better way.
Was any work done on the vehicle and it could be one of the ground loops were left unhooked.
Changing out the computer is a last resort and has lot of headaches with key registration etc. I would not opt for that, before trying other things.
Keep in mind, intermittent problems are almost impossible to solve.