Also not that the switch logic is reversed. The low pressure switch closes
or completes the circuit to ground to indicate loss of pressure. The high
pressure switch closes to indicate the pressure is suffecient. Bad
connections/wiring is a frequent cuase of the buzzer syndrom. The 2 wire
connection can look good but corroision or the wires breaking near the crimp
is a common problem.

Dennis

>From: Allan Streib <streib@CS.INDIANA.EDU>
>Reply-To: Allan Streib <streib@CS.INDIANA.EDU>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Re: OIL warning light up
>Date: Wed, 23 Jul 2008 09:38:07 -0400
>
>  "The Westy man" <thewestyman@GMAIL.COM> said:
>
> > OK, I will check the pressure then change the switch if I have to.
> > 140k on engine, compression is very good, engine quiet, smooth.  And it
>only
> > comes on when I push it up to 2300.
>
>There are two separate oil pressure alarms.  One is triggered by the
>sensor on the crankshaft oil journal, on the bottom left side of the
>engine.  It illuminates the oil pressure lamp (but not the buzzer) if
>the pressure falls below 0.3 bar at any time.
>
>The other circuit flashes the lamp and sounds the buzzer if the pressure
>falls below 0.9 bar with the engine above 2000 RPM.  It is located sort
>of under the crank pully, kinda tricky to get at.
>
>It's not unheard of for the wrong sensor to be installed.  My van had
>the buzzer problem after it warmed up; turned out that there was a 1.8
>bar sensor installed instead of the 0.9 bar.
>
>Good luck.
>
>Allan
>--
>1991 Vanagon GL