Oil light flashing

[retromadness123]

Hello guys really getting tired with this mk1 golf, basically I put in new speedo speed and went for a drive the speedo was working and and all was fine then the speedo stopped and I realised the oil light flashing and a buzzing sound coming from the dash i got it home and check the oil when cold the oil level is correct so just wondering why it did that I have taken dash out again and will fit the cable on again just to make sure that ok for the speedo but unsure why the oil light kept flashing, the Car is a 1.6 1982 golf gti, the wire coming out of the sensor is blue / black would this be the same colour wire to the fuse box, I have seen a blue/ black wire on the speedo harness so wondering if it could be the oil sensor wire, any help where to look or check be ideal, all help appreciated in advance

[colnerov]

Hi, It used to be a trick to connect the oil light to the charging light to make it appear OK, and that's what the DIY wiring is about. It could be that the oil light switch is tired and right on the point of off or on, so either fit another switch or better still put a gauge on it and see if the pressure reading is correct for the engine.

Colin

[jpr1977]

I'd also check the earths, as they can throw up all kinds of issues with these.

Have you got a Haynes, the wiring diagram should confirm re the wire colours and routing.

[duggers]

The buzzer is low pressure warning.
Have you eliminated a faulty sender? I'd try that first before you mess about with wires. Disconnect the sender wire from the low pressure sender (0.3 bar) and see if it still shows a fault when you run the engine, should be blue according to the below link (its yellow on my 88 rocco) .
Blue/Black is the colour used for the high pressure switch and the warning light in A1 chassis of that era.

chris.chemidl.in/wp-content/uploads/2015/04/Vw-wiring-diagrams-1982-1983-1984.pdf this might be some help

[retromadness123]

Hello duggers how do I check the sender thanks

[retromadness123]

Sorry is this the sender that on the side of the head or on the oil filter housing thanks