Can anyone tell me how the Duratec reverse switch is wired? It has three wires and I assume that two of them 'make' when reverse is selected.

I would like to know what the third wire is for.

If the switch is feding an ecu (everythings got a blummin ecu these days) then the 3 wires may be: +12v, 0v and signal.

When in reverse, the switch connects the signal wire to +12v, sending it high.

When not in reverse, the signal wire is grounded sending it low.

This is to stop a floating voltage turning the reversing lights on randomly.

Like I said, if the reverse lights are controled by an ecu, the signal only has to get above 0.6 volts for the ecu to think youre in reverse.

BUT, it COULD be something completely different!

Ed.

Not sure if this helps but in the Haynes Mondeo 2000 - 2003 manual the reverse switch looks like a 2 wire n/o contact unit. However there is a vehicle speed sensor shown that is 3 wire, with 12v feed, gnd and signal connections.

Cheers,

Colin

Ooooohh! So I might have a speed sensor which I can trigger my Evodash with

The switch that I have found is definitely a three pin jobbie (the connector is triangular too) It is on the top of the gearbox (which was taken from a Noble V6 if that makes any difference)

Have I found the reverse switch or a speed sensor?

The information from the electrical section of the Haynes manual refers to being 2000 on. It doesn't seem to discriminate between the I4 and V6.

If you have the connector and flying leads then do the wires tie up with the following as shown for the vehicle speed sensor?
pin 1 - gnd - Black/Orange
pin 2 - output - White/Blue
pin 3 - 12v supply - Green/Red

If so then maybe you can test it by fitting a pull up resistor and spinning the output shaft with a meter.

BTW is there another switch for the reverse?

Cheers,

Colin

I've just had a rummage around the gearbox (it's cold out there innit!) and it is definitely a speed sensor because when unscrewed it reveals a little square shaft which spins on a bearing. However the colours are as follows:

Yellow/red
Brown/black
Brown

I can't find anything else electrical on the gearbox - where is that damn reverse switch then?

Allegedly, on the original vehicle the reversing light circuit is controlled by a switch mounted on the gearchange bracket located on the top of the transmission casing. It requires you to remove the air cleaner and mass air flow sensor when installed in the original car.

DKITH

Cheers,

Colin

Aha! That would account for why I haven't got one then! The original rod change was swapped for a cable version (not sure about the reason)

Looks like I will have to put a switch of my own in somewhere. Hopefully a strategically place microswitch should do the trick.

Thanks for all the help guys - much appreciated

[Edited on 5-2-06 by RazMan]

Mike, Don't forget I,ve got the Ford TIS DVD if you need wiring info.

Thanks Brian, I think I will pay you a visit soon

The local garage had a 'P' reg Mondeo Duratec V6 in when I went for MOT last week. The engine was blown and they were fitting a replacement the owner had bought from a write off of the same year. Not one connection was the same on the replacement engine, the mechanic was having nightmares about it.

Found it!!

...or rather the hole where it should be - right on top of the gearbox I can order it from Ford but its £25 + vat