Couldn’t help noticing the tach is almost pegged at around 6K. The key and other gauges look to be off. Perhaps a bad ground to the instrument cluster? Might explain Carson losing his battery early on to a charging issue associated with a bad exciter or diode in the alternator? Hmmmm... I have an ‘81 VW Rabbit Convertible with very similar gauges to the DMC-12 and they do this all the time. That car is rife with grounding issues! Or was this a “feature” from the factory to make the car look like it was almost redlining all the time?
For the record, a dead battery will NOT prevent the doors from locking or unlocking, nor will it prevent the doors from opening. The doors themselves do not rely on any electrical components to open or close. The central door locking system, which is electrical, reverts to manual operation in the absence of a 12V power source.
Carson was stuck in an earlier production DeLorean that was loaned when the doors jammed, but this was unrelated to any electrical fault. Rather it was likely a combination of an early production door made on "soft" tooling, the absence of the "door guides" that were fitted to later cars and a poor fitting door.
You are correct about the door lock mechanism. It can operate electronically or mechanically, and will work just fine without electricity. Having said that, it is possible to get stuck because of an electrical problem. The central lock module can inadvertently send a constant “lock” signal to the door lock solenoids. This would be very difficult to overcome manually, as the solenoids are strong. However, as the battery (or the solenoid) wore out, you’d eventually be able to manually unlock the door. You could also disconnect the door lock module, or the battery. My door lock module was removed long ago to prevent this.
The electrical tach - an AC Delco produced part, as was the entire instrument cluster - will "rest" pretty much anywhere with the key off. Turning the key "on" will return it to zero until the car is started.
Imagine a Carnac bit... (Putting the envelope to his head): “There’s a sucker born every minute” (Reading the card after opening the envelope): “What do you say when you hear someone paid $115,000 for a DeLorean?”
As the long time owner of a 1982 DeLorean, I can say that it is still one of the more "interesting" collector cars out there. It was not without some mechanical issues while I have owned it, but it still draws the most attention at local car shows. People will literally take cell phone pictures of it while I am driving down the highway (I own other collector cars and that never happens with them). The cat is iconic and the magic starts when the stainless Gull Wing doors open. My wife and I have taken it to many parades over the years; we like to throw candy to the small children from it and it always get very appreciative comments. The engine and drive train (V-6 engine and 5 speed manual transmission) are just lively enough to enjoy it for spirited driving (But it is not a muscle car and does not have Super Car performance). Just driving is enough of a good experience for and maintenance parts are readily available from DMC in Texas. Definitely worth adding one of these 39 year cars to your collection. The DeLorean stainless steel styling and awesome looks are timeless. It was a car made before its time.