Date: Tue, 26 Apr 2011 00:20:28 -0400
Reply-To: David Beierl <dbeierl@ATTGLOBAL.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: David Beierl <dbeierl@ATTGLOBAL.NET>
Subject: Re: Testing Vanagon Headlight Switch
In-Reply-To: <BANLkTim4ibCZ_T2Fdt-Q63pf2YBuzgj_cw@mail.gmail.com>
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At 08:46 PM 4/25/2011, Chris S wrote:
>Based on the schematic on page 97.56 of the Bentley manual, terminal 58 is
>parking lights and terminal 56 is headlights.
Yes.
> When testing between terminal
>30 and 58 I see continuity when I press the switch to its first detent, as
>expected. When testing between 30 and 56, I see no continuity at all
>I need some help to make sure I'm testing this properly.
Look more closely at the drawing of the switch, which is shown in the
"off" position. All those wires a b c d at the top of the page are
all 30 circuit (i.e. live all the time) and wire d comes to the 30
terminal on the right side of the switch. Note that there is an
internal jumper in the switch to a second 30 terminal which supplies
another wire feeding the clock. That wire f is incorrectly labelled
as a 15 (switched) circuit and feeds the clock.
Inside the switch, notice that in either of the two "on" positions
the 30 terminal makes contact with the 58 terminal, energizing the
parking light circuit and also the panel dimmer circuit. Observe
further and see that these are the only connections made by the 30
circuit in the headlight switch. If your clock is dying when you
turn on the parking lights, you've got a bad contact somewhere that's
allowing the parking lights to drag down the voltage to where the
clock won't run.
Now look at the left side of the switch diagram. Here you see the X
contact, fed by the X contact on the ignition switch. With the
switch in the headlight position only, it makes contact with terminal
56, which feeds power to the high/low switch. That switch is a
toggle, feeding either one or the other of the low or high beams
through S3-4 or S5-6. The little complication over on the left is a
switch that whenever you pull back the stalk, feeds the high beam
circuit direct from the 30 circuit, thus lighting the high beams
*while the stalk is pulled* even if the normal circuit isn't working
or the key is off. You may have noticed on track 39 that the X
circuit also gets referred to track 89 where it energises the load
reduction relay. The whole point of the X circuit is to kill
headlights, heater fans, rear defroster and wipers while the engine
is cranking. The lights are done directly and the rest by the load
reduction relay.
> My headlights do
>not work, high beams and parking lights work. When I turn on my headlights
>I see the LED clock display slowly fade out. It comes back when I turn off
>headlights or flip to high beams.
>
>regardless of switch position.
>
>Is the switch bad?
Probably not.
I'm surprised the parking lights work. Have here been mods to the
wiring that you know of?
Yrs,
David
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