Not sure what the problem was. My 69 RR will occasionally sit for a few weeks at a time depending on my schedule and weather. I keep it hooked up to a battery tender to keep the battery fully charged. The car sat for a couple weeks until last night. I started the car and backed it out of the garage to clean it up a bit before cars and coffee this morning. Started the car back up and drove it back into the garage without issue. Out of habit, I hooked it back up to the battery tender. This morning, I disconnected the tender and went to start the car. Rapid clicks of the starter solenoid was a I got, then nothing....not even a click. No dome light, dash lights, nothing. I checked the battery connections and everything was tight. Just to check, I disconnected the positive terminal and then reconnected it. Car started fine. No issues since. Any idea what happened? Battery is only about 6 months old.