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Discussion Starter #1 (Edited)


Due to opening and closing of the boot lid, wiring loom attached to boot lid is folding every time. This folding can eventualy lead to breaking of wires within this loom. This breakage can lead to various type of problems from non-operating third brake light to alarm sounding during night.






It is wise to make inspection of this loom in order to see if you have broken wires and you need to repair them.

When repairing them, it is wise to make them tad longer then before, as this will allow more easily folding space thus making breaking less likely to occure next time.

Following is list of wires that are passing to boot lid, for you to be able to identify them.


MG F/TF Boot Hinge Wire Colours & Functions:
---------------------------------------------------------------------------

Mk1 MG F has 8 wires in this loom

Black ------------------------- 0,5 sqared mm - Boot Lid Switch - earth wire
Purple/Red -------------------- 0,5 sqared mm - Boot Lid Switch (when switch is closed this wire is earthed)

Black ------------------------- 0,5 sqared mm - Boot Lock Switch - earth wire
Black/Red --------------------- 0,5 sqared mm - Boot Lock Switch (when switch is closed this wire is earthed)

Black ------------------------- 0,5 sqared mm - Third Brake Lamp - earth wire
Green/Purple ------------------ 0,5 sqared mm - Third Brake Lamp (when brake switch is closed this wire is live)

Purple ------------------------ 0,5 sqared mm - Boot Lamp - live wire
Purple/Red -------------------- 0,5 sqared mm - Boot Lamp (when Boot Lid Switch is closed this wire is earthed)


NOTE: Purple/Red wires of Boot Lid Switch and Boot Lamp are joined in the loom within engine compartment when they pass from boot lid.

Mk2 MG F and MG TF have 7 wires in this loom

NOTE: Boot Lid Switch earth and Boot Lamp earth wires are joined in the Boot Lid


 

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Removing the plastic clip helps a lot take away stress from the wiring loom. Additionallly for the piece of mind you can put 1 or 2 cable ties into the cable housing to strengthen it a bit :)
 

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Due to opening and closing of the boot lid, wiring loom attached to boot lid is folding every time. This folding can eventualy lead to breaking of wires within this loom. This breakage can lead to various type of problems from non-operating third brake light to alarm sounding during night.






It is wise to make inspection of this loom in order to see if you have broken wires and you need to repair them.

When repairing them, it is wise to make them tad longer then before, as this will allow more easily folding space thus making breaking less likely to occure next time.

Following is list of wires that are passing to boot lid, for you to be able to identify them.


MG F/TF Boot Hinge Wire Colours & Functions:
---------------------------------------------------------------------------

Mk1 MG F has 8 wires in this loom


Black ------------------------- 0,5 sqared mm - Boot Lid Switch - earth wire
Purple/Red -------------------- 0,5 sqared mm - Boot Lid Switch (when switch is closed this wire is earthed)

Black ------------------------- 0,5 sqared mm - Boot Lock Switch - earth wire
Black/Red --------------------- 0,5 sqared mm - Boot Lock Switch (when switch is closed this wire is earthed)

Black ------------------------- 0,5 sqared mm - Third Brake Lamp - earth wire
Green/Purple ------------------ 0,5 sqared mm - Third Brake Lamp (when brake switch is closed this wire is live)

Purple ------------------------ 0,5 sqared mm - Boot Lamp - live wire
Purple/Red -------------------- 0,5 sqared mm - Boot Lamp (when Boot Lid Switch is closed this wire is earthed)


NOTE: Purple/Red wires of Boot Lid Switch and Boot Lamp are joined in the loom within engine compartment when they pass from boot lid.

Mk2 MG F and MG TF have 7 wires in this loom

NOTE: Boot Lid Switch earth and Boot Lamp earth wires are joined in the Boot Lid


My wiring broke but before that the alarm would go off if you opened the boot without switching off the alarm first.
I was met with 3 black wires to 3 black wires broken and no matter what way I put them together the alarm does not go off any more with the boot door. I wired them so I had the boot light working and the strip stop light working any other combination made me loose the boot light or stop light. Its MGF Mark 2 year 2000. Can anyone explain what might be wrong.
 

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Discussion Starter #5
This is odd ... if your lamp in the boot is working, then alarm should be working as well. I can think of only two situations - either you have some other broken wire, or alarm is not set properly.
 
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