I got a question from a member asking about headlights. Below is my
response and I would appreciate any comments on it. I have another
question. When the headlights are down, is there anything that keeps
them in place. As I recall, there is a spring that helps keep them in
place but I can't really remember. Also, assuming that there is no
vacuum. Will the headlights pop up over night (in other words, without
the motor running and creating vacuum for the up position?
Below is what I wrote and I am not sure that I covered all the main
points. Thanks, Kim.
First, the headlights won't just pop up without the motor running, or do
yours? On the two that I bought, both without functiong lights (read
functioning vacuum systems) neither would pop up unless the engine was
running. On the other hand, in the dark recesses of my mind I think
that I do remember reading somewhere that someone was getting up in the
morning and finding his lights up. So, that is the first thing to note.
Then you can look at page two of vol 23 num 2 where the article I wrote
is. That has a diagram of the vacuum system. Your problem is probably
with the switching leg, the darker one. If the lights pop right up,
then one of the hoses probably fell off completely -- that would likely
make the engine run a bit rough also. If they come up more lazily, then
there is just a leak. The way that it is intended to work is when there
is no vacuum on the relay (mine has two relays but later cars had just
one), the lights go up. The interior light switch and emergency switch
just cut off vacuum to the relay and that relay is spring loaded to
default to the up position. The routing usually goes from the storage
cannister bumper on 75s) to a "t" that has one leg going to the common
switched
leg on the relay and the other leg going to the emergency switch, then
from that switch to the light switch and from that to the switching leg
on the relay (note that there is a switching leg and three switched legs
on each relay -- the switched legs include the common vacuum supply in
the middle plus one for going up and one for down). To make a long story
short, there is likely a leak and everything can be gotten to either
through the air dam, under the hood, or under the dash and it should not
take more than a minute or two.
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