I have the same issue on a 1978 corvette - Mine do not work at all -


W. Moore wrote:
> Hi all,
> My headlights no longer go up and down with the light switch. They will go
> up and down however with the little switch under the steering column. I
> have replaced all vacuum lines for the headlight system forward of the
> firewall. By blocking the right actuator and relay, the left side pops up
> and down like new. Likewise when I isolate the left actuator and relay.
> Operating together they won't pull the lights up or down, even tried
> squirting WD-40 in the relay ports like suggested here long ago. The only
> thing the light switch seems to do is get electricity to the lights. Any
> ideas on positively isolating the headlight switch as the culprit ? It
> looks like a bear to replace (standing on my head for several hours).