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1993 964 Battery connection problem?

Electrical and Electronic

Vehicle Information: Model: 964; Year: 1993; Body Type: Coupe; Total Mileage: 76000;

I'm having an intermittent problem that has almost left me stranded a few times. After I drive the car a while then shut off the motor and lock the doors I use the key to unlock the doors but the power locks don't work. The interior lights don't come on, and then nothing happens when I turn the ignition key. No dash lights, nothing. It even loses the radio presets, as if the battery has been disconnected, a complete blackout. Luckily it has started after a few tries and drove normally. The battery has been very strong, although I did replace the battery ground wire just in case but it did not help. The radio was replaced a while back, could this have anything to do with it? Also I just discovered that the alarm does not work (shamefully I did not check it when I bought the car). Could this be the cause? My thoughts lead me to the battery again (maybe I missed something). Any ideas?

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