Yep, that's where i'm heading anyway if i proceed to mount 2 fuses to isolate the headbox and playfield circuits.
Sadly the GI fuseholder wiring is hard-wired as 4 pairs of wires, 2 pairs to the headbox and 2 pairs to the playfield, they seem to be near the middle/ends of the wiring loops to compensate for current losses?
Maybe Plan-A will be to add 'connectors' 
and go from there.
Thanx,
Marty.
I'd start with the easiest option - remove half the lamps.. Interesting fault.
