A drain somewhere, such as a light that's always on or an accessory that is drawing off the auxillary power
I have the same problem with an 84 D100. I found the easiest solution was to put a battery cut off switch on the battery. I disconnect it with the switch when I won't use it for more than a couple of days. I bought mine at pep boys for under $20, took only a couple of minutes to put on. Really made that problem a non issue. Only downside is it won't save my radio stations.
You have something drawing power from the battery some thing left on or something shorting out
Then something is on pulling power from the battery. Check all lights and relays.
you have a short somewhere likely bare wire coming in contact with steel and this drains battery.
yeah it have 2
Confirm that nothing is pulling power first. Even with everything off. Next, check the battery to see if it holds it's charge.
The power distribution center is next to the battery.The power distribution center is next to the battery.
The alternator is probably not working so you are running only on battery power. As the battery drains the engine loses power and will not restart if you shut it off. Have your local auto parts store test the charging system and the battery.
Headlights, since they require more power than the inside lights of a car.
It is a meter with a high wattage resistor connected parallel with the meter that drains power from the battery while it is measuring the voltage it is used to test the condition of the battery if the condition is good there will not be a large voltage drop while testing the battery
P1684 - Transmission - Battery Power To Module Disconnected if battery was disconected for a while or battery replaced, it can cause to set this DTC
Dead cell in the battery itself or something is on pulling power from the battery. A light somewhere or a stuck relay.
When a stereo system drains too much battery power, it is time to add a capacitor. The capacitor will not increase the battery, but instead will modulate it allowing for additional stereo usage.