I have an Astra G 2.2. It was working just fine, no issues. Recently passed MOT with no advisories or issues.
Today I topped up the oil and replaced the overhead interior bulbs with LEDs. They aren't the "boy-racer" LEDs bought cheaply online. They are basic white LEDs designed and spec'd for the car bought from Halfords. They fitted no problem and worked great, still no issues.
I then took the car out for a drive and for the first 30 minutes things were fine. Then I was driving along and suddenly the red battery light came on and I lost traction control, ABS, powering steering and airbags (the warning lights for all these came on). The car was still running and I managed to drive home, very slowly and carefully.
The interior and exterior lights are still working, although the high beams won't go on. Radio, wipers and indicators will still come on, but the car won't start after I turned it off when I got back.
I also have the "Engine Electrical Fault" fault light on now.
I tested the battery with a voltmeter while still connected and the engine running and with the engine not and it clocks in at 9.10V.
I find it coincidental this only happened when I fitted the new LED bulbs in the interior but does anyone have a better idea of what this is?