Thanks Scott.

Good to have confirmation on how the VW low pressure switch works.

I had the Jetta high pressure switch wired to the Vanagon oil light.

I guess the high pressure switch never supplied ground as the light
stayed off while driving.

Kinda blows my theory about the brake warning light receiving a ground
when it shouldn't. Regardless it's being rewired.

Thanks,

Neil.

On Wed, Aug 6, 2008 at 2:35 PM, Scott Daniel  - Turbovans
<scottdaniel@turbovans.com> wrote:
> VW engines that have a high and a low oil pressure switch.........
> the high pressure one uses reverse logic.
> it never supplies ground, except when there is suffecient pressure to make
> it supply ground,
> which is the reverse logic of 'normal' oil pressure swithes......the type
> you find in single oil pressure switch engines.........or for the low
> pressure in two oil pressure switch VW engines.  The are grounded, until
> there is suffecient pressure to open , or break, that ground connection.
>
> make sure your 'normal' low pressure oil switch is the kind that supplies
> ground when there is no oil pressure. Like test it with a test ligtht.
> No oil pressure - it's supply ground to the circuit.
> a test light can be used to find power or ground of course.
> that, and only that, is what you want taking to your insturment cluster, if
> it is the kind of vanagon instrument cluster that interfaces with a sinlge (
> low ) oil pressure switch only.
> hope that wasn't confusing.
> scott
> www.,turbovans.com
>
> ----- Original Message ----- From: "neil N" <musomuso@GMAIL.COM>
> To: <vanagon@GERRY.VANAGON.COM>
> Sent: Wednesday, August 06, 2008 1:44 PM
> Subject: Oil pressure switch question (air cooled)
>
>
>> Hi all.
>>
>> I may have the incorrect Jetta oil pressure switch (1.8 or .9 bar
>> "high" pressure switch) connected to my air cooled Vanagon oil light.
>>
>> If I'm reading it right, Bentley shows the stock air cooled oil
>> pressure switch as closed until oil pressure comes up, (engine
>> running) thus shutting off the oil light.
>>
>> True?
>>
>> Extra Reading: --- ;^)
>>
>> IF my Jetta high pressure oil pressure switch is connected to my
>> Westy's oil light, it might be supplying a ground to the brake warning
>> light when it shouldn't. Likely part of my troubles right now.
>>
>> Thanks,
>>
>> Neil.