Join Date: Jul 2011
Location: Cologne, Germany
there are 2 grounds left and right of the radiator on the upper beam, each with 3 or 4 ground wires....which are for side lights and also for the front blinkers.
Since front blinker grounds might also affect the rears, it'd be worth removing and thoroughly cleaning both of these.
photo shows the one on left near the screen filler.
And the rear light plug? you have checked voltage coming from that?
Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.