47 replies to this topic

[ollie]

Hey pete,
You free this weekend, i'll come round and have a look see and possibly a beer see,

[Dangerous]

Just a few clarifications on laws, impedances & frequencies.

Torbirdy, it's Ohm's law that applies for a single path circuit such as a wire with one or two fuses in it. Kirchoff's laws apply for multiple path circuits, and are used to calculate the distribution of current around the various paths of the circuit.

Chris M - Impedance as it applies to AC circuits is proportional to frequency, but that doesn't have anything to do with this fault. It's a DC circuit. It was mentioned that when the fuse is put in or the switch is turned on, that's equivalent to a really high frequency. That's not really the case. Yes, there's an inrush current, which goes from zero up to its maximum in a very short time, but it's not AC - It doesn't cross over polarity at all. The inrush current is limited by the battery internal resistance, wiring resistance, switch and fuse resistance and the end load resistance, but I doubt inductance of any of the components would be a factor at all, unless we're talking about the ignition coil.

Anyway, back to the point - this will be interesting to find out what it actually is. Peter UC, one thing I forgot to mention was to check the number plate light assembly. They are almost perfectly designed to fill up with water and corrode the two globe contacts together if the assembly leaks, or if the lense is broken.

Oh, and if TB = DA, howdy and welcome back.

[Dangerous]

Just a few clarifications on laws, impedances & frequencies.

Torbirdy, it's Ohm's law that applies for a single path circuit such as a wire with one or two fuses in it. Kirchoff's laws apply for multiple path circuits, and are used to calculate the distribution of current around the various paths of the circuit.

Chris M - Impedance as it applies to AC circuits is proportional to frequency, but that doesn't have anything to do with this fault. It's a DC circuit. It was mentioned that when the fuse is put in or the switch is turned on, that's equivalent to a really high frequency. That's not really the case. Yes, there's an inrush current, which goes from zero up to its maximum in a very short time, but it's not AC - It doesn't cross over polarity at all. The inrush current is limited by the battery internal resistance, wiring resistance, switch and fuse resistance and the end load resistance, but I doubt inductance of any of the components would be a factor at all, unless we're talking about the ignition coil.

Anyway, back to the point - this will be interesting to find out what it actually is. Peter UC, one thing I forgot to mention was to check the number plate light assembly. They are almost perfectly designed to fill up with water and corrode the two globe contacts together if the assembly leaks, or if the lense is broken.

Oh, and if TB = DA, howdy and welcome back.

[Peter UC]

Ollie I at home all weekend come over whenever.
Dangerous thanks for the tip of the globe in the fuse box that will help enormously. BTW it's not the taillights as they are disconnected.
I will be attacking this problem tomorrow, I let you know what the outcome is.

[antelopeslr5000]

Im wondering if this is going to put anyone off from asking why there right blinker no longer works

lol...

[Dangerous]

Im wondering if this is going to put anyone off from asking why there right blinker no longer works

That's usually due to a disruption in the balance of orgone enrgy in the steering column after a wheel alignment has been done, and the wheel is slightly off centre.........

[Peter UC]

Alright I've had some progress. I put the test light across the fuse and this is what I found;
The light glows brightest (ie when the fuse would blow) when the parkers are on and the door is open (ie when the interior light should be on)
As I have the taillights disconnected, the wires that go up to the interior light are also disconnected. Also the short occurs when only when the parkers are on and when either door is open. I tried to find a short between the parker or taillight wires and the interior light switch wires but to no avail.
I don't understand why I have a short when the parkers are on and the door is open I didn't think they were connected.
And just to clarify, the light on the test light was not on when only the parkers were on or only the door was open and again I tried both switches but with the same result.

[antelopeslr5000]

What happens when your parkers are on AND you use the headlight switch to turn on the interior light (rather than opening either of the doors)?

[Peter UC]

Nothing, works as normal so it's something with the door switches

[antelopeslr5000]

Sounds like it to me from what you have described.

Try disconnecting the harness from the headlight switch and at the lighting harness connector also. Grab a multimeter and with your doors closed check for continuity at the headlight connector between you park lamp wire (purple) and your door switch earthing wire (white). If you have continuity, then you have found your problem.

Edited by antelopeslr5000, 09 August 2008 - 03:27 PM.

[Peter UC]

I've compared the wiring to the UC and the location of the white door switches are different. The LX has it located on the front left on the headlight switch and the UC has it on the front right. Is the LX supposed to be like the UC? I find this strange as I don't remember touching this wiring and it worked fine before the rebuild.

[Peter UC]

Answered my own question. Yes the door switch is supposed to be the same as the UC. The terminal the door switch was located on is connected to the parker terminal, hence when the door was open and the parkers on there was an instant short. The wire must have come out of the plug at some stage and I put it in the wrong spot.
So problem solved. Thank you everyone for your assistance
Peter

[Peter UC]

Just another question, in my haste to find the fuse problem I forgot to label the wires off the headlight relay. Can someone tell me which wire goes where?
Numbers are 56, 15, 56a, 56b, 31b
Wire colours are white (highbeam switch), Blue (power low beam switch), pink (pollution), green and orange.
Thanks Peter

[rodomo]

This might help?
(But I could be wrong)
http://www.type2.com...ifi/bosterm.htm

[REDA9X]

THIS HELP?

[Peter UC]

Thanks everyone all sorted.

[Dangerous]

Good stuff that you found it