'92 Pre-Cat diode on a wire behind fusebox

[Greg M]

Evening all. Been a while - had so many things on this year I've hardly had the opportunity to stretch the Griff's legs. Put it in for an MOT and - as expected - a new battery was required. No problems there, I said - there's two bolts under the car and the battery tray slides back so you can get the battery out.

Fast forward to me finding out that they have instead removed the fusebox and didn't put it back properly and then it fell out when I wanted to use the car

I found a broken wire behind the fusebox which appears to be a blue and white wire connected to a blue and red wire with a diode - can anyone tell me what this is for? I've looked through all the wiring diagrams I can find and can't identify it....

Many thanks

Greg

Edited by Greg M on Wednesday 30th August 07:22

[FlipFlopGriff]

I had to replace a diode when the indicators stopped working so could be indicators or hazard related. Do either not now work?
FFG

[Steve_D]

The most common use of those colours is...
Blue/white high beam headlights
Blue/red low beam headlights

On that basis I can't think why you would join them with a diode.
Which way does the diode flow?

Steve

[Greg M]

FlipFlopGriff said:

I had to replace a diode when the indicators stopped working so could be indicators or hazard related. Do either not now work?
FFG

Will have to check next time I'm at the car - thanks for the suggestion

Edited by Greg M on Wednesday 30th August 20:55

[Greg M]

Steve_D said:

Which way does the diode flow?

Steve

Of course I have no idea of that...

[Steve_D]

Check the body of the diode. There should be one of 2 marking methods.

It may have a diode symbol which is like an arrow head with a bar across the end of the arrow point or it will just have a ring marked around one end of the body.

A diode is a one way valve in both cases the current flows towards the bar/ring.

Steve

[dnb]

The diode described by the OP is to stop all of the headlights flashing when you pull the stick to flash the high beam lamps, but allow the high beam to be switched on only when the main headlamps are turned on. Hope that's clear!

[Greg M]

dnb said:

The diode described by the OP is to stop all of the headlights flashing when you pull the stick to flash the high beam lamps, but allow the high beam to be switched on only when the main headlamps are turned on. Hope that's clear!

It is indeed the main-beam flash. Was somewhat confusing as I had no working dials, brake lights, indicators, or windows - but that ended up as a fuse.

So, now to locate a diode and have a crack at replacing it. As ever, this forum has proven invaluable.