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an inverter(in this application) takes the 12 volts dc, switches it on and off, creating a sort of ac voltage, which is fed to the primary side of a step-up transformer. the transformer increases the voltage and lowers the current to feed the lights. i don't know if this particular system rectifies the ac back to dc for the lights. but the circuit voltage is a significantly higher voltage than 12 volts, so the battery caution(above) is a very good one. from what i recall seeing on a regal of this vintage, the lamp drive voltage is around 130 volts. there should be a warning tag on the wiring.
my first guess is the inverter(provided power is reaching it).
bill
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'67 CUTLASS 4-DR. W/425 & S.P. THM400 (NAMED "ERNIE")
'83 H/O #1339(STILL IN PIECES)
'85 PONTIAC FIERO SE V-6 4-SPD. BOUGHT NEW
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