Oil LED and buzzer woes!

[rockthebus]

T3, 2.1WBX, LHD European import

Scenario: After sorting out a misfire, and cleaning all contacts in the engine bay. Misfire sorted, and she pulls the best ever!

Problem now is that when the ignition is switched on, on the low pressure switch side the LED flashes once and that's it. On the high pressure side, above 2000rpm the buzzer now sounds.

I've had the instrument cluster out, and tested continuity of pins 12 and 13 to earth, and the wiring on the low pressure side was broken. Fixed the break.
On the high pressure side, i've never replaced the switch, so that has been replaced.

Re-tested the wiring and all looks good.

Measured continuity with ignition on and the low pressure side is open circuit, and goes closed circuit as soon as the engine is started.

The high pressure side is initially open circuit, and goes closed circuit when running (but there is some resistance?) above 2000rpm.

After refitting the instruments, the LED now flashes continuously when the engine is running, and above 2000rpm the buzzer still sounds.

If all the wiring to the instruments is OK, what/how do I do next?

Thanks in advance

[marlinowner]

Low pressure switch should be closed when engine is off and opens when oil pressure comes up, sounds like the wrong switch fitted.
Try grounding the wire to the high pressure switch, if buzzer still sounds above 2000 rpm then there is a problem with the wiring or with the buzzer circuit. If buzzer no longer sounds, then either high pressure switch is faulty or oil pressure is low.

[rockthebus]

Thank you for your advice.
The PO had rewired the connectors in the connector connection back to front!
All sorted now and working as expected!
Glyn

[marlinowner]

Nice one!