BSA M33 Plunger - 1955 - New Lucas Wiring Loom - diagram followed religiously, new battery 6v positive earth, refurbed, Lucas Magdyno, new solid state rectifier.
Lights switch off / off from the battery, all good.
Run the bike, get it night are warm running for about 20 min, all good... except the lights have died....
Leave the bike for 30 min or more to cool down... lights come back on.
Its a standard off the shop floor 6v positive earthed system, the magdyno was professionally rebuilt... I am so confused... any ideas?
Any ideas warmly welcomed!