All I can say is, disconnect the negative cable from the battery first. Lots of things back there are wanting you to let the smoke out of them.
Well I guess there is more I can say...
There is a spring-loaded button on the light switch which allows you to pull the knob out. Push the knob in all the way first. Then you remove the chrome bezel with a large screw driver. You should have plenty of slack in the wires to pull the switch out to look it over.
Carl


1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission