Bob and all,
I was just looking at a wiring diagram I have and I believe you have a bad
switch. That switch is just a plastic cam that causes the contacts to make.
If the contacts get over heated, it melts the plastic on the cam an no more
switch. I fixed one once by using some scrap plastic and a soldering iron to
rebuild the cam.
That switch is hot, fed by a red wire coming from the bus bar on the input
side of fuses 1,2,3, &4.
It feeds power back down a yellow wire to fuse 5 which then brances off to
all the parking lights and clearance lites. Because your lights all go out in
one position and this wire is in both high and low beam circuits, is why I
believe you have a bad switch.
I also feeds power back down a green wire to fuses 7 & 8 and a grey wire
to 9 & 10 for the high and low beams.
You can check for voltage at these various fuses and if there is none you
can jumper 12 volts to them and make sure the lights work.
I put relays in my Duetto and use the switch to provide the low amperage
to operate them.
Happy hunting,
Skip Patnode
'67 Duetto
Norfolk, Va
Date: Mon, 6 Dec 2010 16:21:09 -0500
From: "Johnston, Robert" <[email protected]>
Subject: [alfa] More Light Weirdness
Folks,
Got a '73 Alfa Spider, US spec. Have owned the beast since I drove it
brand
new off the dealer's lot on 30 Jan 1974 (all comments about the stupid things
the previous owner did have to directed to the mirror!). Recently, when I
move the headlight switch lever down for high beams ALL lights go off,
including the instrument panel. On the regular (up position - dipped)
position the lights are fine. Headlights are Carello H4s (probably been
there
since the early 80s). Have shot contact cleaner into the switch to try to
get
things going to no avail. Switch was replaced with one off a junked Berlina
also in the early 80s. Think I tossed the original switch then too so I
don't
have a carcass to experiment on. Have looked at the switch with the thought
of disassembling it but it looks daunting. Any ideas on how to proceed or
test points that I can explore with a multimeter to troubleshoot?
Thanks
Bob Johnston
Brighton, MI
'73 Alfa Spider
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