weird fog light problem

[Dan Simoes]

Well, I have no idea what it was, but I tested your theory using a spare
switch, and it was working fine.  So I went back to the old switch, and
that too worked fine.  I'm putting it back together and will keep an eye
on it.

Thanks for the suggestions.

| Dan |

Huw Powell wrote:
> 
> Dan Simoes wrote:
> >
> > Good idea, but that's the odd part.  The switch itself has 12v going
> > into it, and has two outputs, both supplying 12v each.
> > Somewhere, there is a drain bringing it down to 6v, but I can't figure
> > out where.  I'll have to look at Bentley again.
> 
> At least you have the Bentley, I'm working "blind"!
> 
> The rear fog switch has *four* terminals that are combined when it is
> on.  One would be power in.  One would be power to the rear foglight.
> One would be power to the front fogs, and the last one seems to turn its
> indicator light on (the big arrow).
> 
> I suspect a poor closure of the switch inside with enough internal
> resistance to create your voltage drop, and still say you should clean
> the heck out of it.  You could always try measuring the resistance
> between the various terminals.  i wish I could remember the terminal
> numbers from when i was doing it.  i wish I had your Bentley...
> 
> >
> > Huw Powell wrote:
> > >
> > > you might try giving the inner guts of the rear foglight switch a good
> > > cleaning.  That has been essential to getting full functionality out of
> > > the dash switches in my 90.  clean the slider contacts, and spray
> > > cleaner into the inner sanctum where I suspect the actual "switch" is
> > > hidden away.
> > >
> > > Dan Simoes wrote:
> > > >
> > > > Here's an odd one.
> > > >
> > > > Background:
> > > > On the 1990 90q 20v I just recently purchased (yes, I'm already working
> > > > on it!), the front fogs are missing.  I took out most of the dash
> > > > switches to replace bulbs, and in doing so noticed that there was a cut
> > > > wire behind the rear fog light switch.  I fixed this with a buttsplice
> > > > connector (which I rarely use) and it seems fine, has 12v on both sides
> > > > of the wire.
> > > >
> > > > Ok.  Now, symptom.
> > > >
> > > > With the front fog light switch on, there is 12v at the front fogs, as
> > > > there should be.  When I use the rear fog light switch, the rear fog
> > > > lights up, and the fronts are only getting about 6v, which begins to
> > > > drop if I leave the switch on.
> > > >
> > > > There must be a current drain somewhere, but I can't guess where.
> > > > Bentley shows that the rear fog switch energizes the same wires as the
> > > > front fog switch would, in getting juice to the lights.
> > > >
> > > > Anyone BTDT?  Just wondering.
> > > >
> > > > Thanks.
> > > >
> > > > | Dan |
> > >
> > > --
> > > Huw Powell
> > >
> > > http://www.humanspeakers.com
> > >
> > > http://www.humanthoughts.org
> 
> --
> Huw Powell
> 
> http://www.humanspeakers.com
> 
> http://www.humanthoughts.org