This is a problem I'm trying to solve on my kid's 68 Nova (L30, Powerglide). Not a Camaro but close enough for me to muck with.
Problem is the battery is slowly draining down. Looks to be about a 2 to 2.5 amp drain on it. Tried pulling all the fuses, replaced the voltage regulator, disconnected the horn relay, tested/disconnected the alternator, pulled out the aftermarket radio, ruled out the starter. Still discharging.
I put in a battery disconnect in the meantime but I'd really like to fix this. It's driving me crazy (a short drive, ha ha).