Skip the auto shop - Our mechanics make house calls

Q: Battery drains overnight - 1990 Cadillac Allante

asked by on

My car has gone 154,000 miles. It's been running fine with no major problems. However, there is the issue with the battery drain. The car battery is new. I checked the alternator as well and it works correctly. The battery still gets drained after the car sat for the night. All the lights turn off when I turn the car off. There is nothing obvious that could be draining the battery. Do you have any idea what could casue this?

This problem can be diagnosed by connecting an ammeter to the positive (red) battery cable, observe the current drain (likely less than 1 amp). Then, one at a time, remove each fuse, check to see if the current drain has dropped to near 0, then reinsert the fuse. This process should identify the faulty circuit in most cases. A professional mechanic, like YourMechanic, can perform this procedure for you, and replace/repair the failing component.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Battery drains overnight - 1990 Cadillac Allante

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Blinkers and brake lights

The problems you described may have different causes that will need to be checked separately. The headlights may be switch or wiring to lights or even the bulbs. The right front turn signal may be just a bulb needs replaced...

Q: Screeching noise when turning key

This noise may be the starter internal gear reduction making the noise. The starter would need to be replaced to get rid of the noise. The battery should also be checked. I recommend having a mechanic, like the ones from...

Q: Turn signal flashing quickly. 1996 Oldsmobile Achivea

Hello there. A fast flasher is a common fault with the 1996 Oldsmobile Achieva. There are a few potentials causes, such as a failed left side turn signal bulb, a turn signal flasher that is faulty, a failing turn signal...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...