Oil Pressure Warning Light

[myoldjalopy]

Red Ignition light works as expected/normaly

If, as others have suggested, the wiring to the lamps has got mixed up, then this would indicate the oil pressure is OK and that there is an issue with the charging system. It might be worth checking voltage output from the alternator to see if its behaving normally.

[Wes]

Red Ignition light works as expected/normaly

If, as others have suggested, the wiring to the lamps has got mixed up, then this would indicate the oil pressure is OK and that there is an issue with the charging system. It might be worth checking voltage output from the alternator to see if its behaving normally.

Across the battery terminals: 12.4V at rest. 14.2V when running. guessing thats pretty normal/ok?

To recap. Newish alternator (by the looks of it) & negative earth. Red light & yellow lights on as key turned. Red goes off on start up. Yellow dims/flickers on idle getting brighter as revs rise.

[Wes]

Wow you guyss were bang on. PO wired bulbs the wrong way around. Couldn't get to mounting screws to get speedo out but with drivers glove box out the way I could just get my hand in and swap the bulb holders.

So just leaves question that if fan belt is ok & reading across the battery terminals of 12.4V at rest and 14.2V when running. Why is the now correctly wired (green & white) ignition warning light on & flickering when engine running and revs up?

[Wes]

BTW thanks ever so much for the tip on crossed wires.

[geoberni]

So, what we have is a Red Ign Light that's behaving normally, so we can discount crossed over lamps and all the talk about Alternators etc.

On Monday you said:

Take wire off switch: yellow light stays on
- Touch wire to earth: yellow light stays on.

This was presumably with engine not running.
With the wire off the Sw, the lamp should be off.
So completely disconnected from the Switch we have a light on at all times and then when the engine is started and things are vibrating a little we get

Start car yellow light flickers at idle and gets brighter more constant as revs rise.

This makes me wonder if we have a chaffed/trapped cable that is shorting to earth and when the car is vibrating it's intermittent.
15 - Back of fuel gauge/voltage stabiliser
18/19 - Heater Switch and Blower
25 - Oil Filter Warning Light (presumably not fitted from what you've said)
26 - Oil Pressure Sw and light

Oil Light Issue.JPG (34.34 KiB) Viewed 4330 times

So what you need to do is find the inline connector I've pointed out with the arrow, up behind the dash somewhere.
If there's no filter light, then there should only be 3 green wires in it, the supply from (15), the feed out to the Heater (18/19) and the feed to the Oil Pressure Light & Sw (26).
Being careful not to let anything touch the body, separate the connections and confirm which one has battery supply when Ign is ON; then continuity the other two to earth (one meter cable to the connector, the other to the chassis).
With the Heater switched Off and the cable pulled from the Pressure Sw, both should be open circuit.

See what you find....

[Wes]

Weirdly ignition light now stays on even when key is removed

[Wes]

Yellow Oil light behaving as it should now

[geoberni]

Weirdly ignition light now stays on even when key is removed

Now you've really confused me.....
Remote diagnosis gets so hard.....
Are you 100% confident that Lamp with Green/Yellow is in the Oil Light and the Brown/Yellow and White wires are on the Ing Light.

[Wes]

Yellow lamp now has Green/Yellow & green wires coming from it
Red lamp now has green & white(ish) wires

[Wes]

Let me look again!

[Wes]

Top right lamp which is yellow now has green & green/yellow wires
Botom right lamp which is red now has yellow and light beige wires

[geoberni]

Yellow lamp now has Green/Yellow & green wires coming from it
Red lamp now has green & white(ish) wires

That sounds right for the Oil light, Green one side and Green/Yellow the other .
The colours on the Red Lamp could just be discoloured with age, but should be Brown/Yellow one side, and plain White the other.
No Green anywhere on the Ign Lamp......

[Wes]

see update on wire colours:

Top right lamp which is yellow now has green & green/yellow wires
Botom right lamp which is red now has yellow and light beige wires

below

[Wes]

Top right lamp which is yellow now has green & green/yellow wires
Botom right lamp which is red now has yellow and light beige wires

Guessing the light beige could well have been white once

[svenedin]

Top right lamp which is yellow now has green & green/yellow wires
Botom right lamp which is red now has yellow and light beige wires

Guessing the light beige could well have been white once

Before I changed my loom all the white wires looked beige with age.

[Wes]

bottom right bulb holder

[geoberni]

The Beige will be the White, the yellow is hopefully Brown/Yellow but the Brown is all on the far side of it.

But now we have this problem....

Weirdly ignition light now stays on even when key is removed

All alternator conversions are a bit hit and miss, because it depends on the electrical competence of the installer....
If I were working on it myself, I'd be checking voltages here and there, but not knowing, or seeing, the exact installation it's hard to know where to start.

It doesn't make any sense as you've described it; when it was in the other bulb holder it wasn't on with the key out, so why is it on now just because you swapped it over...???

[Wes]

It doesn't make any sense as you've described it; when it was in the other bulb holder it wasn't on with the key out, so why is it on now just because you swapped it over...???
[/quote]


AARRGGHH

[Wes]

2 steps forward 1 back!

[Wes]

Well blow me. Tried the car this morning. Turned on battery and no lights! turned key and both yellow & red come on. start car yellow goes out but red stays on blinking/flickering. But still getting 14.2V at the battery??