Cheers peeps!
Found out the purple multi-plug is for a fuel pump saftey relay (or something like that), there's 2 relays mounted on a plate behind the dash (drivers side), a black one & a purple one.
Still not too sure what the blue & the grey multi-plugs do, so if anyone has a XR3i please could have look behind your dash & tell me what they plug into?

Thanks

Gavin...