Stuart, If it's factory, the switch is under the steering wheel.
The contacts sit in the bottom of a two piece assembly. The turn signal lever attachs by a screw into the top half. The contacts are located above and below where signal lever is attached. There doesn't appear to be enough room to give the contacts a good dousing spray. There are two 'J' shaped spring contacts, I've seen these go bad. To get to the switch you will have remove the steering wheel. Mar-Kee still makes the switch, but there are 2-3 different ones for 60-66. You will probably have to buy the complete switch. I haven't seen just the 'J' springs. Shop around I've seen $10-30 difference in price. If the light socket and bulb are good, there's only one wire for brake and turn signal, and that appears good.
Larry
