oil pressure warning light

Make sure the wire is on the sensor on the engine or the wire is not broken anywhere.

cheers p76, think it must be bad connection cos it worked ok this morning and when i left work. i love these electrics!!

Well, have been running with no oil light for some time now so decided to investigate tonight. I cleaned the terminal and made sure it was tight. Wire appears in good condition so far as i can see before it disappears into loom. How can i test the wire and / or the switch itself?

cheers

check the wire for continuity between sensor and bulb. for the sensor hook up a test light with engine off and then start it up.

cheers for that! will give it a go.

Sorry to drag up an old thread...

Did this ever get resolved? I am having the exact same problem at the moment. The switch is tested and working, the bulb is good, I have continuity from the switch to the binnacle but the light just will not come on. Problem in the binnacle itself? What did you do in the end? I want to fit an oil pressure gauge at some point but would love the light to work as well.

I have a 1989 RRC 3.5 Efi by the way.

I've got the same problem - I just figured that the cheapo pressure switch I fitted was dodgy and haven't got around to replacing it.

Well, an update on this. I got the binnacle off and removed what looked like some corrosion on the circuit board. It was right next to the copper track that feeds the oil warning light.

All cleaned up with contact cleaner and re-fitted and the light worked, excellent! I thought...

Light then stopped working, more contact cleaner, light worked, then stopped. Dry joint on the circuit board which I hope to find and resolve tomorrow.

I tried replacing the oil pressure switch first, as it was an easy fix. No such thing on these old girls!

Will update with progress.

All fixed. There was a break in the circuit board on the back of the binnacle. A friend with a steadier hand than mine bridged it with solder. Now on to the next problem...

v8david said:

All fixed. There was a break in the circuit board on the back of the binnacle. A friend with a steadier hand than mine bridged it with solder. Now on to the next problem...

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Happy days

Not letting an old thread die
'93 Classic LWB. I started getting the oil pressure light coming on after the Au Pair drove "briskly" through a large puddle. I took the connector off the switch and cleaned it, put it back. Light worked correctly for a few days then came on all the time for about an hour, then quit for good, giving me the same failure state as described above.

The oil light doesn't illuminate with the ignition, so i guess potential issues could be busted switch, broken connection to the sensor, bad bulb in the cluster, broken connection on the board in the dash.
Whats the right order to diagnose the fault ?

Disconnect the wire from the pressure switch and use a multi meter to confirm the switch is working. If not replace switch. If yes, then work your way back upstream with the multimeter.

Start with the easy checks.
1, Turn the ignition on, pull the wire off the switch and touch it to ground, the light should come on.
2, Run a wire from the positive on the battery to a light bulb (12 volt preferably) and connect a wire from the other side of the light bulb to the switch. The bulb should light. Start the engine and it should go out.

If the light comes on when you do 1, then the bulb, the dash and the wiring between the two are OK.

If the bulb lights when you do 2, the switch is OK. However, if it stays on with the engine running, it might be a faulty switch or it might be that you have no oil pressure..... That's not good news.

I'm 99% sure this is an electrical issue vs mechanical. I'll test the switch this evening.

Just to confirm. My issue was that the 4 week old switch was defective.

Not a Britpart one by any chance?

I was super frustrated about it. I'd ordered STC4104 from atlantic british but received a different sender when the package showed up (AMR2092). I'm not sure if it was britpart, but it failed pretty darned fast.

Oil pressure earths the light when pressure is down & open circuits when pressure is up Should be power to 1 side of the light the other goes to the sensor & cant really test it . If in doubt replace it too risky to trust it .

rkbooth said:

I was super frustrated about it. I'd ordered STC4104 from atlantic british but received a different sender when the package showed up (AMR2092). I'm not sure if it was britpart, but it failed pretty darned fast.

Click to expand...

Looks like they sent you old stock http://www.paddockspares.com/amr2092-amr2092.html so you ordered the correct part but got the older one.