Cheers for the input Tommy.
Been in garage since daft O'clock yesterday, finally found the problem
Mucho corroded connections in every multiplug.
Every plug pulled apart & cleaned, turns out the fault with headlamps was caused by the plugs under the left fairing infill panel.
Already sorted it before seeing Tommys reply, thanks for your info.
Not surprised really, 14yr old bike, you always inherit work on any used bike or car, neglect from previous ownership etc.
I bought a standard tidy bike as I wanted something fast'n'quiet for a change from my ear splitting modded Moto GP sounding ZRX1136R.
Fazers a way better bike loads more BHP as standard & it handles ok for a standard bike, after I sorted the badly setup suspension.
Defo a brown pants moment if a light failure occurred on a night ride.
Glad it's happened while bike was stripped really.
Onwards & upwards, cleaning/painting bits to tidy the old girl up a bit.
Next jobs..
New tyres, better levers, Renthal lows, standard bars break my wrists.
Rip out all that octopus AIS bollox, block off zorst inlets.
R6 shock on its way shortly, dog bones sourced.
Probly fit an Ivans kit somewhere down the line, bikes quick enough as it is.
Clutch cables dragging so that's to do, probly replace clutch as it feels like springs are past their best.
Svc etc, mod/advance ignition rotor.
Just the usual never ending stuff.
Anyway from experience, headlamp faults!
Multiplug under left infill fairing is a highly recommended 1st port of call.
Loving the bike, even with all its issues.