Thread: Post-recovery rapid battery drain

It sounds like your starter & aux batteries are now wired in series rather than parallel .

1:00pm

Starter 16.74

Aux 17.08

Originally Posted by Scouse

It sounds like your starter & aux batteries are now wired in series rather than parallel .

But the wiring hasn't changed since I got the car. It's all hooked up how it was. The two batteries are linked through a Solenoid.

So voltage has levelled out. Even raised from last reading. What does that mean??

I need to drive my brother to the airport at 1:30, so I'll take another reading soonish, then drive him there and take another reading when I come back.

Try disconnecting the batteries and take the reading off each battery the aux should be around 12.8 or so as it has been in the car for a while the new battery could be anywhere it may have been sitting for days or weeks at the shop. But neither battery should be any where near 20v

12:05pm

Starter 16.73V

Aux 17.06

12:30pm

Starter 16.63

Aux 16.98

1:00pm

Starter 16.74

Aux 17.08

1:26pm

Starter 16.79

Aux 17.08

1:30pm

STARTED CAR AND DROVE IT UP DRIVEWAY

Starter 17.41 and climbing

Aux 17.47

2:16pm

DROVE TO AIRPORT (30-45mins)

While engine is running:

Starter 14.49

Aux 14.49

2:56pm

BACK HOME (30mins driving)

While engine is still running:

Starter 16.36

Aux 16.36

Engine off

Starter 15.7 and dropping

Aux 16.3 and semi stable.

3:20pm

Starter 13.37 stable

Aux 13.87 stable

Disconnect your AUX battery, and check the voltage.

Then check the voltage of your new starter battery, preferably out of the vehicle.

I am suspecting the solenoid in your change over cct has been damaged when the car fell over, and if so, your batteries MAY be in series and not parallel.

You really need to know what the unloaded voltage of the batteries is.