Relaying dim-dip headlights - Type 44
human747 at attbi.com
Tue Dec 10 22:50:30 EST 2002
> When I rebuilt my Ur-q I took the opportunity to rewire the headlight loom
> with 2mm cable and install relays. All the relays are mounted inside the car
> alongside of the auxiliary relay plate. This allowed me easy access to the
> dim-dip circuit. I've posted info at
"I tried a number of ways to retain the dim-dip function, one of which
resulted in a rather amusing
self-energising circuit which, unless the correct sequence was followed
would leave the headlights on
when the switch was off - even if the ignition was off too."
hehe, i remember the first iteration of my coupe headlight system had a
few rather unexpected results - things that would stay on under strange
circumstances, things working really weirdly. A few diodes cleaned that
up, it was mostly due to having relays tied together to be switched by
in different ways by the same signals. It takes something like 7 volts
to trigger the relay, so "on" was no problem, but they don't turn off
until voltage drops below 5 or so. So if I had two relay coils in
series "by accident" they might stay on - whichever one was on, that is.
> the new dim-dip stuff is at the bottom of the page.
Cool. bizarre feature, though. nice to see it explained, I was really
wondering what that question was all about!
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