[wrmyers35]

Thanks for your comments!
It says Delco Remy on the back, so I assume it's a GM. I think it's a 12si since it's 12 volts, negative ground.
It's a new battery and new cables, but I haven't checked for loose wiring.
When I turn on the headlights without the engine running the ammeter shows discharge.
I added some wiring when I installed the AC, so I'll check all for loose connections.