The light is just an indicator that the OD is switched on with the switch, It's in series with a wire that goes from position 87 on the OD relay under the bonnet and earth which is made by the bulb housing to the dash. Easy first check is at the relay. Wire maybe loose or corroded. Then pop the light out of the dash and check at that end. The fault might just cure itself with you handling the wires but best to check it through using a meter etc for 12v and continuity. With car parked engine off, put it into top and switch OD on with ignition on. Light should come on and the solenoid should click along with the relay.
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