Hi Ray me again I did a quick Google search & found this from mg forum
not sure if it's any use can't be much different surely
Test it first before digging in to it or spending money.
The gear lever switch and wiring is a bit flaky as it is continually waggled about on the gear lever, and it should be fused as Garth says. On UK spec cars the place to do this is where the two whites in the main harness go to a 4-way bullet by the fusebox. There should be two more whites in the other side, one goes to the fuel pump in the rear harness and the other to the OD in the gearbox harness. The fuel pump should be fused as well, both mine have suffered damaged harnesses in PO hands. If you get two in-line cylinder-type fuse holders with bullets on the ends, and two 2-way bullet connectors, you can fuse them individually. If you get one fuse and one 4-way you can fuse both circuits with the same fuse. Use the standard 17 amp rated 35 amp blow, they are perfectly adequate to protect the wiring, there are two spares in the fuse box, and it avoids a proliferation of fuse types.
You can test electrical continuity of the OD circuit with either a test-lamp, voltmeter or ammeter. Open the circuit at the above conenctors and insert the tester. Turn on the ignition, select an OD gear, and turn the manual switch on. You should see the test-lamp light or the volt-meter register 12v, but these are basically go/no-go tests. If you use an ammeter you should see about 800mA, which check the resistance of the circuit as well as confirming continuity. *Make sure* the test-lamp goes out or voltmeter or ammeter cease registering when you take it out of an overdrive gear, on UK cars you must move the gear lever across the gate away from the 3/4 plane to do this. Move it in and out several times to test the lockout switch. When you are happy with that put it back in overdrive and slide the manual switch back and fore and make sure that breaks and makes the circuit reliably as well.
If all that works take it and test it.
Sybhil