right ime guesing this could be an eath isue. when the lights are on and i indicate the right rear tail lights dim when the indicater light flashes

that's a common problem and is down to earth for the tail lights as you say.

right so if i re earth the rear lights it should be ok? well that will be an easy fix on the car then

Yup, just clean up or provide a decent earth for them.

Hehe this was one of the things my car failed it's recent MOT on.

And the 306 we used to have. A common problem on Pugs (French wiring ), and older Fords too (mk3/4 Escorts and Sierras I know have this problem)

right now added to the list of little problems with my car to sort out

ok any one got a clue were the earth is for the rear light on a phase one mi

It'll be in the loom somewhere. Try cleaning the multiplug to the bulbholder and packing it with diletric grease. If that don't do it then use a multimeter or wiring diagram to idenify th earth wire in the loom to the lights and intercept it to lay in a new earth, which may not be a bad idea ayway.

The earth for the rear light clusters is behind the plastic panel in the boot below the boot latch. On my old car I ran new earth wires to the same point. It has a crappy multiplug that rattles around, but if you unplug it you will see a bolt that you can fix the new earth wires to. Then replace the plug. I used self tapping screws to get a good connection onto the light clusters.

sorted the problem took a trip to des developments changed the ecu for another one and and cars running as it should be very weird

my daughter had probs with her 306xsi and it turned out to be the internal earth on the ecu. quote for new ecu was stupid, so fitted external earth to ecu and all is well. only cost 37p

mainly took to trip to des to get the odd cutting out on idle looked out this was diagnosed as a sick ecu with that replaced everything else that was playing up has sorted itself out