Electrical problems

[raykay]

Originally Posted by SD1too

Frank,

You've probably already found out that the ATC system uses electronic blower control and not the traditional relay pack. A member recently had a fault with his and successfully repaired it.

Simon.

There is a relay for the blower motor, no. 5 in the engine bay fuse panel.

The blower motor is earthed via a transistor pack which varies the speed, controlled by a PWM output from the ATC panel.

[SD1too]

Originally Posted by raykay

There is a relay for the blower motor ...

Oops ... I should have written resistor not 'relay pack' in my earlier posting.

It is now duly corrected.

Simon.

[frankgoldstar]

Dear All,

I finally got to have more than few minutes to look at the car and took out the fusebox to check the wiring for damage as has been reported.

As originally reported the major symptoms I have are no heated rear screen, and no heater blower, so no screen clearing either end.

The fusebox wiring was good, apart from a rather heavy Brown/Grey wire which was disconnected, with the spade connector roughly insulated.

There is an empty slot for the spade connector in a Blue triple connector cage, but not knowing what is what, I decided not to just stuff it in and hope!

The centre connector in the triple blue cage goes to FL12 and has a Brown/Pink wire connecting to it.

Now in the Haynes (a thousand and one things not to do to a car) manual diagrams, I can only find Brown/Grey wires connecting to/from FL12, and no reference to any Brown/Pink wire to/from FL12.

The top connector in the triple/blue connector connects to FL8, but so far I have found a refrence to the what FL8 does.

I did not have time to find where the top connector in the triple blue connector cage goes as it went dark.

So in summary, the wiring has a disconnected wire.

This wire is Brown/Grey.

This wire would appear froom the diagrams to need to go to FL12, but that slot is occupied by the Brown/Pink wire that I have not found a reference to.

I have not been able to find sufficient information to enable me to confidently check the wiring out.

I have no idea why a Brown/Pink wire should be connected to FL12.

I have no idea why the Brown/Grey is not conected

I did put a meter between the disconnected Brown/Grey wire and earth, and there was no connection, or between the live battery terminal and the wire.

Anyone any better documentation than the Haynes effort, or any other ideas?

For anyone looking at this for the first time, the usual things have been done.


Best regards, Frank B

[raykay]

It seems that someone has messed about with the wiring, there should be two Brown/Slate cables from FL12, one 4mm in terminal 5 of the black connector and one 2.5mm in terminal 12 of the natural coloured connector, they both go to the ignition switch connector, 4mm to terminal 5, 2.5mm to terminal 6.
The 2.5mm is the general feed to the ignition switch, the 4mm is the feed for the immobiliser ECU and starter solenoid.

A 4mm Brown/Pink should be in terminal 1 if the blue connector, it is from FL8 and feeds the ABS ECU.

[SD1too]

Originally Posted by frankgoldstar

Anyone any better documentation than the Haynes effort, or any other ideas?

Frank,

I've sent you a P.M.

Simon.

[frankgoldstar]

Dear SD1too,

being but a child in the internet age, I have checked my two email accounts and not found any pm from you.

Can somebody help me out here?

I expect I will find out I have an account somewhere here on the site, but I need more help with 'tinternet than ****** cars!


Best wishes, Frank B

[kissifer1972]

Originally Posted by frankgoldstar

Dear SD1too,

being but a child in the internet age, I have checked my two email accounts and not found any pm from you.

Can somebody help me out here?

I expect I will find out I have an account somewhere here on the site, but I need more help with 'tinternet than ****** cars!


Best wishes, Frank B

Top right of the page Frank, it will say Welcome, frankgoldstar and under that it will say, in blue, Private messages: Unread etc etc

Click on the words in blue and that will take you to your mails

Chris

[raykay]

Near the top of this page, underneath 'Welcome frankgoldstar ', click on the blue 'Private Messages'.

[Johnny the Fox]

Originally Posted by SD1too

Frank,

I've sent you a P.M.

Simon.

Simon would you happen to have a wiring diagram for the 75??

[SD1too]

Originally Posted by Johnny the Fox

Simon would you happen to have a wiring diagram for the 75?

If you're interested you can buy the whole official MG Rover workshop manual in paper form from Rimmer Bros. The wiring diagrams are not particularly user-friendly and really need to be consulted in conjunction with the descriptive text.

Simon.