Check the fuse box on top of the battery. Have a close look at the line coming in from the alternator (far left as you look at it).
If the bolts are not tight you get arcing and the whole thing gets too hot the wire burns out and the plastic burns. Then the car runs on battery power only, until it goes flat.
The lights coming on are a sign of low power, I had those exact symptoms.
Look what happened to mine![]()
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