Besides what Rolland suggested you can also check your light socket with a multimeter or a testlight. To check for voltage with a test light at a given point
Clip the black wire to a good ground (as above.)
Touch the point to the terminal/wire being tested.
If the light lights, the circuit is getting power. you can perform the same test with a multimeter and it should read about 12volts when either the light is on or the indicator is on. Make sure you have the right bulb. Some bulbs fit but do not touch the proper points. Check the backside of your light and make sure that all the wires and cotacts are still intact and make good contact. Let us know what works and what does not so we can continue to assist you. Good Luck