83 GTI Electrical gremlins

[MRMENDER]

This is on Huw's car Drove it to the NEC last month when wipers fan stopped working.
Fuse's 10, 11, & 12 Have no power These are Heater fan, Wipers Inc washers & Rear wash wipe.
I have changed the fuse box no difference. I guessed it would be futile as there was no evidence of anything wrong with the old one. I suspect that I have a break in the loom? If I bridge out with wire from a live supply (Horn) all works perfectly.
I can follow the wiring diagram so far! The supply is on track D, question which colour wire is the supply?

[mr.brown]

X Contact Relief Relay - tried replacing that? From memory that's the only common thing with power for several devices. I could be making that up though...

[DannyH]

a faulty ignition switch can cause anything that needs the ignition switched on to malfunction?

[MRMENDER]

X Contact Relief Relay - tried replacing that? From memory that's the only common thing with power for several devices. I could be making that up though...

What do you mean X Contact relief relay?

Its not the ignition switch just tried my sapre

[GTXTRA]

it's a silver relay, think it's got a 53 marking on it H. I've replaced one on the GTL at some point after a few 'odd' electrical issues.

[mr.brown]

Silver, number 17 on it, bottom row, 2nd from left. It's actual function is to cut power to all devices when cranking - but if it's faulty it may be cutting power to those devices all the time.

[MRMENDER]

Thanks Mr Brown
All sorted now thanks found a used but good No17 Relay in my shed.All is now good!