Thanks Tim, yeah that's my gut feeling. I've just had to rebuild the light switch stalk on a Datsun 240z as all the current runs through it for the lights. The terminals were a bit dirty but not that bad looking, but clearly enough such that I got no lights at all. Similar story with the heater switch on my 69 Econoline van and also did a similar job on a Lamborghini Urraco ignition switch. So I guess stop one is to pull the cowl and take a look at the switch with a view to swapping or trying to dismantle and clean.
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