[T3] FW: Progress Thanks to P.A.

[Dave Hall]

Think of the idiot light circuits like this (they are all the same idea):-

+12V (on black wire on gauge cluster with ignition on)----->(idiot
light)--->(oil pressure light)--->ground.

There's no earthing fault on the gauge cluster that will make these lights
flash.  The only common point in the wiring is the +12V, which I assume is
being pulsed somehow by an incorrect wiring of the flasher relay.

Your flasher unit is operating when the ignition is on, rather than when you
turn the flasher lever.  The hazard switch is just that - a switch that
makes both sides of the flashers come on together.  It also connects the
battery direct to the flasher unit for when the ignition is off and the
switch is pulled out.

You DO NOT HAVE a steady +12V on that black lead - it is somehow being
pulsed by your flasher relay.  

The indicator circuit is:-

+12V(15->hazard switch->49+)--->(49+ ->flasher relay->49a)---->(indicator
switch)----->(flasher bulbs selected by indicator switch)--->ground.

That's a bit simplified as there is also pin 49b on the flasher relay that
puts 12V on the flasher idiot lamps in between the pulses to the flasher
lamps.  The 12V on the black wire feeds the idiot lights then grounds
through the flasher bulbs.

It's hard to make it clear from this distance, but if the indicator switch
has given trouble, it may be behind the problem. 

It's certain that without the black wire having a steady +12V on it, it will
pulse the idiot lights.  You need to find out why it doesn't have a steady
12V.

Dave.
UK VW Type 3&4 Club
=================== 


-----Original Message-----
From: type3-vwtype3.org-bounces at lists.vwtype3.org
[mailto:type3-vwtype3.org-bounces at lists.vwtype3.org] On Behalf Of Adriel
Rowley
Sent: 01 June 2011 04:53
To: type3 at vwtype3.org
Subject: Re: [T3] FW: Progress Thanks to P.A.




----------------------------------------
> From: Bobsnotch at aol.com
> Date: Tue, 31 May 2011 20:36:01 -0400
> To: type3 at vwtype3.org
> Subject: Re: [T3] FW: Progress Thanks to P.A.
>
>
> In a message dated 5/31/2011 6:18:24 P.M. Eastern Daylight Time, 
> dave at hallvw.clara.co.uk writes:
>
> The idiot lights have to have a 12V supply when the ignition is on. 
> Maybe that's the problem. They are not grounded in the cluster at all, 
> but by the various circuits.
>
> The oil pressure switch simply grounds that bulb when the pressure is 
> low, the ignition warning light (low voltage/not charging) simply gets 
> grounded when there's no charge to oppose the 12V that should be on it 
> when the ignition is on. The same power lead is used to light the 
> flasher indicators when the switch is on left or right (either one 
> lights BOTH bulbs) when the flasher relay is off to the flasher bulbs 
> themselves. The flasher idiot lights ground through the flasher lamps 
> themselves. That's why the main bulbs flash opposite to the idiot 
> ones.
>
> I won't say that all three faults will be cured, but it sounds as if 
> you've not got the 12V supply to the idiot light/fuel gauge cluster 
> from the ignition fuse (ie only hot when ignition is on). It is 
> carried by the BLACK wire into the back of the cluster. I've sent you 
> a photo by separate email.
>
>
>
>
> This was my thought as well (both the ground issue, and no power). I 
> think Jim was trying to say the same thing, when he suggested looking 
> at the
> 72-73 wiring diagram in the Bentley. My thought was like yours though, 
> that the idiot lights were passing the ground thru their circuits, 
> when he's trying to either use the TS, or dash lights.
>
This is where real time be better.  I feel like yelling, as I have to say so
much to possibly make a little progress.  Not you alls fault, but my lack of
how to say it all clearly...  It was so easy to call Russ and he would walk
me though it, with amazing skill and patience.  

So, if the idiots are acting as ground, why then does the indicators still
flash with ignition in run position?  I am not touching the turn signal
switch (even
eliminated) or the dash lights.  

Let me explain again.  I get in with key in off position, touch only the
key, when turned to run position, the gas gauge, indicators, and idiot
lights flash.
No turn signals until the switch is moved to open the right or left circuit
or E.F.S. on; all lamps work properly, checked twice by Gizmo Bob and Jack
(thanks again!).

Really late, and the dog's snoring is putting me to sleep...


Thank you so very much Bob!
Adriel
 		 	   		  
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