😬 😬problem solved. I removed the rear wheel and follwed the wire back through the wheel arch, through the panel next to the fuel tank, down onto the chassis tube and found the wire chafed through. The handbrake cable was rubbing against the group of wires cable tied to the chassis 😔.......
inserted a new bit of wire and.........nothing. Rear indicator not working with front going twice as fast.
I removed the grommet going through the inner wing and got access to the connector that sits in the space next to the fuel tank. Undid it, blew in it, put it back to tgoether and bingo 😬 😬
this posting is left to assist any other unfortunate souls who gets really pi$$ed off with silly electrickery problems