Electric problem

[ASHD@morgan.com]

I have an 86 Audi Quattro Turbo. The rear lights have generated a fault.
With the sidelights on, if indicating I get a side light flash also on
both sides, this is true for indicating left or right. Also with the
hazards on the side lights dim if turned on.

The computer tells me `check brakes lights'. I had all the rear light units
out and they work fine. The fuse holdings look good as do the relay seats.

Anyone help with tips where next to look???