There are three screws under the top cap of the motor. Remove those and the top will lift right off to get to the bulb. Just remember to have the directional arrow pointed in the right direction when you replace the top. I had to replace the bulbs in two of my 36V motorguides this spring. The local service center wanted $3.50 each for the bulbs. Went to an auto parts place (Carquest) and got a box of 10 for about .79 cents apiece. Curt