Also check if your open circuit voltage at the AC side is about 80V. If good voltage level, it can be connection problems, wiring, or diode(s). If diodes, one may be open or high resistance.
If low voltage level on all switch settings and source breakers are good, with no load (open circuit), then the transformer may have shorted windings if the magnet wire insulation got too hot. But that older unit probably has pure copper windings, very good stuff! So if it is low then something is wrong back towards the transformer.
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