since ur car is not OBDII u might just wanna look @ the battery or the alternator. if ur battery wants to be ghay and its not holding charge it may not have enough voltage to keep all the electrical stuff goin until it regains charge after a while. i had that problem w mine and it took me weeks to figure it out cuz i have OBDII. i checked everything except the battery and almost took the car to the dealer.
best way is to disconnect ur battery and check the charge in the morning if that turns out fine dont disconnect it and check it the next day again something might be draining it over time.now if the battery checks out fine check if the alternator gives of the right charge and if that isnt it u can start digging deeper. that is the first thing i would check because its the easiest and its free
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