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Possibly defective alternator.
It could be two things. As you know, the alternator charges the battery so it will not drain. If the alternator is not working properly to charge the battery, the battery will continuously drain. Have the alternator tested at your local Auto Parts store (NAPA or Advance Auto) If it is good, have the battery checked.
The battery is located under the rear seat.
its under the back seat....
Under the battery tray
start by checkn the Battery,I would put my lights on to see if they are workn, if they are not then it is your battery. If not could be your alternator.
Check for a loose ground.
If you have the wrong size battery in a Cadillac with the northstar will it effect the alternator voltage?
I have a 2000 Deville DTS. The battery is located below the back seat. Just pull up the seat (not back), and you will find the battery.
The battery is located under the rear seat (passenger side).
Yes, if it fits.
Walmart or Sams Club.