Hello, despite excellent wiring diagram on this site I seem to have a short somewhere in the horn/interior light/wiper circuit.
I'll try to isolate by testing each circuit in turn but could someone help me by confirming whether I have the interior light wired correctly?
The photo is looking from driver's seat towards front of the car. On the right is a black earth wire; on left nearest windscreen is brown wire with black tracer that is connected at the other end to the driver door switch. The other wire on the left is purple.
I believe you have the Black and the Brown / Black wires the wrong way around.
The Purple feed goes to the bulb metal contact ( closest to camera ) which is correct.
The Brown / Black wire ( Door courtesy switch ) should be the other end of the bulb metal contact on the right of the picture.
The left hand wire should be the Black earth " contacting / completing " the circuit once the slider is operated.
I think that should sort the problem out.
Bob
i think the interior light and horn are both on the perm live fuse and the wipers are on the other fuse which comes live when ignition is on , anyway back to the question, you could try disconnecting all three wires to int light to see if this rectifies the fault but i think if the black and brown are the wrong way it would just put the int light on all the time hope this helps graham
I think the Lilac should be where the Black is - and the Brown/black should be where the Lilac is - and the Black where the Brown/black is at the moment. This allow the lamp to light with the switch - and also when a door switch is closed ie when the door opens. What you have at prsent shouldn't cause a 'short' - but the light will be ON all the time. The wiper problem is a completely different circuit.
The power feed (purple) should be connected directly to one end of the light, a switched earth (black/brown) from door switches connected to the other end of the light on the switch connection(on my car the door switches connect together on the drivers side) and a permanent earth (black) connected to the other switch connection (so the light can be turned on when the doors are closed)
You should have the purple wire on the direct connecton to the light, with the other two wires either side of the switch, but should be other way round as suggested by mogbob
Thanks for the replies guys. I've just popped into the garage and re-wired as suggested but still no joy so had a look at the wiring behind the dash.
At the moment the main lilac feed from the loom is joined to the interior light lilac wire in a double bullet connector socket. However also attached to the same socket is the passenger door switch brown/black wire. Presume that's wrong? The interior light black earth is connected to a multiple earth socket.
If passenger door black/brown wire is not connected to the lilac feed where else could it go? I was interested that Andy's door switches appear to be joined but that doesn't appear to have been the case on this car, though I could modify to do that if necessary.
Black earth is OK if the physical connection is bright and clean metal tag and bodywork underneath.
Passenger door switches , your Brown / Black wire as Andy has said should join Drivers side , under dash area in a double
connector.( So that's passenger side wire across under the dash joining a short wire coming up from the driver's door switch ).
From the double connector a single Brown / Black ( not the correct colour by the way but it's probably what a previous owner had spare ! ) goes up the inside of the A post ,windscreen edge and emerges by the courtesy light.
Your presumption is correct, the lilac ( Purple on the wiring diagram ) wire should not be joined at that double connector.
There should be a separate purple feed for the Horn but that should be in the engine compartment from the fuse box , main loom , emerging from a branch of the main loom by the horn.The horn push ( switch to earth ) wire should be Purple / Brown attached on the other end to the second Horn terminal.
Wipers. Graham is correct they are on the ignition side with the feed being a Green wire from the fuse box to the wiper switch. This should be separate from the interior light / horn issue as mentioned by Roy.
You're welcome.
Time of posting ! No I'm not the real Santa .My wife has been ill , flu, hacking cough, terrible sore throat so anything more than an hour of uninterrupted sleep is a bonus at the moment. Sleeping when I can , regardless of what the clock says.
Bob
You must NEVER join wires of different colours together.....so there should only be Lilacs in that connector. Both interior light and horn are fed by live Lilac wires - and switch ON by earthing the outgoing side of each. The horn by the 'button', and the light either by the switch or by the door switches...
[quote="bmcecosse"]You must NEVER join wires of different colours together.....
Couldn't agree more, but the wiring in this car has been interesting to say the least. Non-standard wiring colours and extra switches etc that appear to serve no purpose (with the exception of a fuel cut-out). Glad to say that the interior light is now working perfectly but the horn isn't yet. At the moment the lilac/black wire from the main loom is connected to the brown/black wire from the steering column loom - is that correct? More investigation tomorrow.
Great that you've " sorted " the courtesy light. Onto the next problem.
Horn
At the horn itself what colour wires do you have on the two terminals and second question, do they both go into the loom ?
The power supply from fuse box to horn should have been a purple colour wire.
The second wire , horn to horn push should be a purple / black wire.
What has the previous owner rigged up / bypassed and with what coloured wires ?
Whatever colours you have , you can always check out both ends of the wire to establish it is only the two ends of the same wire ! Using two wires, attach a crocodile clips to each end ( 4 ) of the wires.Take a 9 volt battery ( PP9 ? ) and either a bulb or a small buzzer ( Maplins ).Detach the terminal ( for the wire to be tested ) from horn and the other end at the fuse box. Attach the crocodile clips to the terminals. Make the circuit complete and either the bulb will light or the buzzer will sound
i.e. you have a complete length of wire not the " ends " of two separate wires ( no light or no sound in this case ).
Test the second wire , horn terminal to horn push in the same way.
Take out the bullet connector from the small mini loom underneath the dashboard coming out of the steering wheel cowl.
Hopefully the short loom up into the steering wheel will be "original " and therefore the colour, maybe faded a bit , should be
OK.Clean up the terminals to bright clean metal as you go.
Appreciating the previous owners antics , I'd prefer to double check before assuming things. Basically test the theory first
with a harmless circuit test using a nine volt battery.
Overall ,once you sort out the issues make a note of the "actual " wire colours used on your car to keep with your reference Electrical circuit diagram , if you've not already done so.
Bob
Thanks Bob (and others). Delighted to say that the horn is now fixed. In the end it was quite straightforward. After cleaning all contacts and checking the wiring (which was fine) I removed the steering wheel and found that the indicator stalk clamp had worked loose so there was no contact with the slip ring - and no self-cancelling on the indicators either.
Been a successful Christmas holiday so far - interior light and horn sorted, new vinyl on rear inner wheel arches, carpets and seatbelts fitted. Next job is to sort out the non-functioning washer pump...I'm hoping it will just need priming...I'll report back in due course!
