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you can either pull out the headlight **** all the way, or there is a vacuum switch underneath the steering wheel by your legs, it's a tiny black **** that you pull down. Since it's vacuum the engine has to be on for it to work.
I also had problems locating the vacuum switch. Turns out that the **** was broken off flush with the panel covering the steering column. It should be there and it will have (2) vacuum hoses connected to it.
There is a cover plate right below the steering column. Take out the 4 screws and the switch should be attached to that cover. That's how it is on my '80 anyway.