Indicators Affecting Braklights Mot Fail

[sketch.tki 0 1 Cars]

My indicators are making my brakelights flash also affecting interior lights and dash lights, I checked and cleaned all earths and added new ones, its got brand new alternator and battery, starte and alternator cables. Cleaned out light clusters and tried different bulbs. Nothing seems to make a difference was thinking a new relay or indicator stalk. Anyone got any ideas as I am running out! Cheers

[Anthony 1,003]

It will almost certainly be an earth fault somewhere - it's usually the rear light one that causes the problem which is located behind the N/S tail light.