I haven't begun to fully investigate why my lights only open & close when I up my RPM's (naturally it's upping the vacuum) but I'm sure it's some sort of vacuum leak. The solenoid is an aftermarket rebuild one, as evidenced by the ground wire. But what I was wondering is since I have no reason to turn the lights on/off when the car isn't running, could the vacuum reservoir under the fender be eliminated? I noticed that the hose running from the carberator to the vacuum reservoir has a splice at the solenoid. Was this put in for just this reason? Naturally, my vacuum reservoir could be fine and this question is for nothing, but it may help someone who has this problem.