Both electric windows on my 1980/1 262C Bertone have decided to stop working - typically with both half-wound down.

The problem isn't the fuse or the relay behind the dash (changed both, cleaned contacts etc.), and all the switches (and wiring to them) appear to be in good shape.

I haven't had a chance to check properly, but there is definitely no power across the electric window fuse terminals when any of the switches are depressed. There's no response or noise from either motor with the door panels off - I can probably run 12V direct to motors to get them closed, but is there anything obvious to check when the circuit isn't getting power?

Everything else electrical is working as normal, although I did lose dash lights and ignition very briefly the same day.

Any ideas?

Thanks in advance.