Stinger 3.3T 2018 battery discharge

[Matus]

Hi, I'm new to this forum and I'd like to ask for your advice. I'm from Europe so please take my English with a grain of salt .

I've owned a 2018 Stinger 3.3T for 2 years. Lately I've been having a battery drain problem.

The whole story started with the original battery in the car and one day I couldn't start it. So I figured that since the battery was original, it must be the problem and I bought the same new AGM battery which I installed.

I drove the car for about 2 days when the problem happened again. The battery was so drained that I couldn't even open the car with the key fob.

We then took the car to the service center where they found that the car had a low idle current draw and at such a high rate that it could drain the battery from night to morning.

The mechanics can't help because they've checked the electronics but can't figure out where the problem is.

I've probably read all the forums where this or a similar problem has been solved. But no one has written a solution to the problem when they solved it

Please give me any advice that will help get the stinger back on the road :-D

Thanks, group

 

[Snicklefritz]

Calling, @Ah GetFd the battery guy.

An AI search return says that it could be "... a faulty alternator with bad diodes that grounds the battery when the engine is off.

"Other critical factors include chronic undercharging, where the vehicle's alternator voltage (typically 13.5–14.2V) is insufficient to fully charge the AGM battery (which often requires 14.8V), leading to sulfation that reduces capacity and causes rapid self-discharge."

 

[Matus]

electricity consumption with the vehicle switched off remained high even after removing the alternator fuse

any other options?

 

[Ah GetFd]

Calling, @Ah GetFd the battery guy.

An AI search return says that it could be "... a faulty alternator with bad diodes that grounds the battery when the engine is off.

"Other critical factors include chronic undercharging, where the vehicle's alternator voltage (typically 13.5–14.2V) is insufficient to fully charge the AGM battery (which often requires 14.8V), leading to sulfation that reduces capacity and causes rapid self-discharge."

I think possibly you had two problems.

The first was the battery reached end of life. Lead acid batteries go through sudden death. That is, they are fine at 5 years and dead at 5 years and a day. Unannounced. That's "sudden death"

Lead batteries corrode from day 1 during "charging". As current passes through the positive plate, it corrodes. Over 500 or so cycles, the equivalent of completely discharging and recharging the battery 500 times, plates are corroded sufficiently that they break. They break usually on the "last" start you achieved of the starter motor. The current is high, the plate is weak. Snap. You drive away because the engine started that time, the power is now supplied by the alternator. When you stop. There is no more battery to restart the car because it has already failed. "Sudden death"

500 complete cycles translates into thousands and thousands of 10 second starts....or 3 second starts........and minutes of recharge. Each time you draw that current from the battery, the alternator replaces it as you drive away. Charging. Corroding........

The second was on installation of the new battery it caused another issue.

So I think this is what has happened.

When you have come to replace the battery with a new one, you may have inadvertently shorted the alternator. It can happen quite easily by touching a cable to frame or tool to frame. It is always important to remove the ground lead first. This is normally the negative then there is no path for a positive cable back to the negative terminal should it come into contact with the frame.
Just because the battery positive is no longer connected to the battery, it doesn't mean that other parts of the car aren't still connected to the positive of the battery. Touching the positive terminal to frame with a tool can also cause untold damage.

I would have thought that there was an alternator light however or charge fail, or an engine light. "Something" to let you know that there is a problem.