[MARKDTN]

Sounds like a wiring issue.

If you have high and low headlights, it simplifies it some.

Basically you have a light blue wire from the headlight switch that supplies power to the floor dimmer switch when you turn the headlights on.

The dimmer switch has tan wire for low beam and light green for high beam. These 2 wires go through the firewall bulkhead to the forward lamp harness. At the bulkhead, the light green wire also goes back to the cluster to light the high beam indicator.

If high beam indicator is not working, look for power at the cluster connector on the light green wire with high beams on. If you have power then you have a cluster printed circuit issue or similar. If no power, look for power at the firewall bulkhead terminal. Sounds like your problem is with this wire.