New Battery, No Power/Lights/Starter

[FFOG]

Went to start car and battery barely turned over the engine. Charged battery, had lights and horn but no starting (nothing. Not even an attempt to start. Dead as a door nail. Bought a new battery, connected the same way. 6 volt positive ground. No lights, no horn, no turning over. The battery is grounded to the frame. Battery test to 6.5 volts. Amp meter isn’t registering anything. I’m stumped.