Okay, now I might be a bit thick here...
Since sorting out the wiring problem the car runs fine, but, the stereo doesn't work.
Also, the temperature gauge doesn't work. I've checked the connections and the fault is not obvious.
The stereo came with -C- so I assumed it wanted the code, which i do not know, so i have swapped it, but although the new unit (tape) would whirr, nothing appeared on the display and no lovely noises came out of the speakers.
I fitted a CD player instead, which would accept and eject CDs, but showed no display and played no music.
I checked the fuse box - aha! - fuse gone. I swapped it for the spare which went "fizz!" as i inserted it.
Does this mean I am thick and should disconnect the battery before fitting a new fuse? Or is too much current going through the circuit since the re-wire which blows the fuses?
It's a puzzle! I hate elctrical faults.