Chris,
As mentioned on the other thread, earths are often an issue but remember that 12v
feeds carry the same current. Your first go-to is the origin, so check connections around
the steering column first, test for true voltage at the
relevant fuse (mine currently suffers from 10.4v, similar issues to yours)
I hope to cure my issues by rewiring, and simultaneously removing the hazard switch issues.
Nigel