electrical problem dash

[jexps]

Hello

I have a problem with my 1987 t25 1.9l transporter dash clock set. I replaced the original clock set a few years ago because of faults and replaced it with a second hand clock set with an audible warning device for low oil pressure, which i didn't realise at the time. What year were the audible warning devices used up till? I am wondering if i have bought the wrong clock set for my camper as there is nothing wrong with my oil pressure, but the audible device will not stop buzzing.

Also i would appreciate a diagram or a photo of all the wires that feed into the clock set and the order of them as i am struggling to understand the haynes manual.

thank you

jode

[collins_sh]

i would just suggest you disconnect the buzzer, otherwise the only thing to follow is the haynes manual and attempt to wire it up as intended by VW diagrams

[AngeloEvs]

Your van should have the oil pressure warning system and were introduced around 1986.

Here is a schematic (click on the image to enlarge it) with pin connections of the dashboard circuit but note that it shows LED's for the Main Beam/panel lights rather than conventional bulbs. All post 86 models share the same circuit irrespective of whether they have a Tacho, Glow plug LED, etc).

The PCB responsible for monitoring (and warning of low oil pressure) above 2000 rpm is housed in the speedometer and only the connections to it are shown. I would check the high 0.9 bar oil pressure switch siutated close to the water pump and that it connects to chassis when the engine is started. If the engine is started from cold then this should close (connect to chassis) without the need to rev the engine. The description of the DOPs (Dynamic Oil Pressure System) (Buzzer of Doom) can be found in the WIKI