Date: Thu, 14 Jun 2018 12:21:12 -0700
Reply-To: Roger Whittaker <rogerwhitt1@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Roger Whittaker <rogerwhitt1@GMAIL.COM>
Subject: Re: Electrical puzzle
In-Reply-To: <09012F2B-F95C-416E-BF36-93F7FC441927@comcast.net>
Content-Type: text/plain; charset="UTF-8"
Dear Dimly Lighted
Maybe the issue is not electrical at all —
Maybe you have tugged on the parking brake peddle in some way - either at
the application end inside the wheel hub or along the connecting linkage —
or evenpushed the Pedal or pulled the handle a tiny bit — have you tried
releasing at the cabin end first - :)
Regards
On Thu, Jun 14, 2018 at 9:57 AM OlRivrRat <OlRivrRat@comcast.net> wrote:
> On behalf of a friend who is a fairly new Syncro Owner & 1st time
> Vanagon Owner ~
>
> > I recently had starter trouble and changed it to a TDI unit with adapter
> plate. while I was at it I put a starter relay in. Starts great, seams to
> run fine. FYI That was a pain in he ass to get in there ... small spaces.
> among other problems I had to butcher the plastic servo for the diff lock
> to get it to fit with the new starter.
> >
> > However, now my brake warning is half on. it is dim, less bright then if
> I turn it on for real with the parking brake. It is only on when the engine
> is running. If the key is in the on position, but the engine not started
> the light works correctly.
> >
> > - I have thoroughly tested the brake fluid level switch (and then
> disconnected it)
> > - I have thoroughly tested the parking break switch
> > - Starter and Engine seam to be working great
> >
> > study of the bentley Manuel as well as probing with my multimeter I have
> found that the brake warning module is connected to:
> > 1) Brown/yellow: brake fluid sense switch and parking brake switch (same
> pin) . 2.5V. 0V when parking brake is on.
> > 2) Red/Black: #50 starter circuit. 0V when not started, 2.5V when
> started and light is half-on. 12V when starting.
> > 3) Black: 12V
> > 4) Brown: GND
> > 5) Yellow/Red: some seat belt stuff I have not looked at closely.
> >
> > I also noted that #50 goes to starter, digifant, idle-control, brake
> warning light module, and ignition switch.
> >
> > from the forums I found the following suggestions
> > 1) bad circuit #50 connection to starter::: I took everything apart and
> tightened and cleaned and redid both this and the alternator connection at
> the starter.
> > 2) bad ignition switch :::: I had a new spare. no change
> > 3) brake light switch error (master cylinder)::: on this year, these are
> 2-pole switches and there is no connection to the brake warning light. it
> goes only to the brake lights.
> > 4) bad grounds ::: well I tried everything I could think of, including
> using jumper cables to add extra grounding to the motor near the alternator
> and near the digifant. no change
> >
> > So back to the warning module in the dash board... I decided to probe
> the voltages there. Is 2.5V the correct voltage for signal #50 when the
> engine is running ?
>
--
roger whittaker 604.414.6266
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