Had same issue at 181,000 miles years ago on my 1989 240 GLT one night at 11.30pm on the M6.
Managed to drive 12 miles home with the dash lights like yours illuminated and headlights going dim so only turned on when car coming the other way.
In my case alternator had died. Had another fitted at garage a further 5 miles away and that turned out to be faulty. Charging at max 12.15v!
James.
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