Q: Voltage drops from 12.5 to 3.0 when key is turnned to acc

asked by on

I just bought this 2001 lesaber from an older lady . Super nice car , though it won't crank over. She had gone to start it herd a loud pop from under the hood like a fire cracker. Stater would engage but it wouldn't crank over. Engine turns fine by hand . So we check the voltage at the jump point under the hood , it showed 12.5 . When I went to start it it dropped to 3.0 volts . So I'm thinking bad battery maybe, took the one from my truck and put it in the Buick . Now nothing works at all !! No accessories what so ever. Checked all the grounds and cleaned them , no evidence of bad ground cables or anything. Voltage still drops when I turn the key on , starter will no longer engage! Any advice would be appreciated. She had a starter put on it before I looked at it too, no difference, by the way

My car has 117000 miles.
My car has an automatic transmission.

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. Voltage drops from 12.5 to 3.0 when key is turnned to acc

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: A/c blowing cold air intermittently with warm air

Hello. If the system continually blows hot and then cold, this is typically caused by a failing blend door actuator. If it fails, it can allow the temperature door to not hold the right position. It can also be caused...

Q: My car makes noises when I make a turn

If you did not get all the air out of the system or fluid leaks then you may be low on fluid. You should also make sure you used Honda approved fluid type. If it is not low or incorrect...

Q: Hey I have a 2000 Buck Lesabre and I'm having some fuel issues I think

Fuel is a possibility but so is air induction particularly the idle air control (IAC) valve. The IAC valve may be sticking which would explain the first symptom you report which is everything was great until you simply put it...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...