I’m having a nightmare with a number of peculiar electrical problems.
I can’t get my oil level and pressure gauge to work. Keeping in mind I have fit a new engine loom, new genuine level sensor and new genuine pressure sensor.
I also don’t have the oil pressure light, handbrake light, water temp light or the oil pressure dial part on start up.
I have tried 4 different speedos, all known to work and the same issues.
I have 12v to the speedo, 2.3v at the oil gauge plug on the speedo, 2.3v at the level sensor plug
Also, the left hand indicator bulb on the speedo stays illuminated when the lights are switched on. I’ve cleaned the rear earth under the light and the a pillar earth many times, no change.
I’m no auto sparky, but there’s power where there needs to be power. I’ve tried all the usual fixes and still all of the above!
I had the no warning light issue years ago on my old white gtt. I believe the issue was down to earthing on the engine loom. Maybe give the connector of doom a wiggle under the bonnet.
First thing would be to short the connections to the oil level sensor, and see if that moves the dash needle.. if not, it will probably be the needle at fault..
I thought it was just the passenger inner a pillar that has the earth’s? I’ve cleaned these up and no difference
I tried that with the level sensor, absolutely no movement. But, I took one working speedo, shoved it in my phase 1 and everything works, then straight into my phase 2 and nothing!
I noticed today with the engine running the oil warning light is on. I have no idea if I should be concerned or if its just another electrical issue. You can also see the gauge is slightly illuminated like it does on start up.
i think there is an earth on both sides of the dash, I think earthing sounds like your issue.
the oil temp and level gauges will have 12v feeds, earths and a signal wire
handbrake/level is just 12v into the clocks, through the bulb, and if either the hand brake or the reservoir switch ground the light comes on.
oil pressure switch is grounded with engine off, so when clocks get 12v (ignition) the light comes on. When you’ve got pressure the sensor (switchopens and the light goes out.
Oil light staying on while running, and indicator staying on suggests to me you probs have a mix up of earths and power.
probs just one mistake
a multimeter, basic as you like, 2 functions, voltage reading, and continuity. Should be able to work through it and see what is working properly and what’s getting confused and why.
continuity through a wire in itself,
And continuity between something and earth
Helping with wiring over the internet is a nightmare, I hope some of that makes sense and doesn’t confuse things further
i thought the sender wires maybe back to front, So i checked my original loom and sensor, nope, they are correct! Orange wire, large connector, brown wire small connector
i flipped them around and ran the car anyway, only change was no oil light or gauge light. Still no life in the oil gauge
i have painted the block and zinc plated that front earth bracket, so possibly.
I probed the positive of the battery to earth at front of the block, shows 12.5v. I’ll try the jump lead tonight
Looking forward to your findings! I also have issues with the oil gauge, and I also fitted a new loom recently.. Sometimes I can get it to work when I switch the wires around on the sender unit, then next time I turn on the egnition it it works no more.. I’ve come to suspect the ignition barrel or a relay somewhere, but haven’t looked too much at it yet.
