Overdrive not working

[Stevo302]

Next job i was not intending to have to sort out...

Overdrive not working now. Ive done something but not sure what.
My overdrive switch light on my dashboard lights on and off as i switch it. I can hear the relay clicking behind the dash when i switch the switch on and off. Just taken it for a spin and its not engaging in 3rd or 4th.

Any ideas?

Thanks.

[Stevo302]

Sorted. Ready for the pre 80's meeting.

[Tyre Smoke]

What was it?

[Stevo302]

Re checked/ cleaned earths, and all connections. Basically a bad connection somewhere.