As Art suggested, "So, number one, your alternator and its ground are suspect, and the result is the battery is not getting charged".
Before you go digging into the dash, check the ground wire from the alternator to the engine block. It is a short stiff wire that can break at its connectors.
What you could try, to confirm the ground is missing, is to ground the alternator body with another wire. Eg. Jumper wire from alternator to a good ground. If the lights come on, then the ground wire is likely a problem.
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1980 245 Canadian B21A with SU carb, M46 trans, 3:31 dif, in Brampton, Ont.
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