Quoting tonino: just to hijack the thread
i did the relay mod a few days ago, fitted a new std starter, but i still have the click from time to time (cold or hot, doesn't really matter)
i have double checked battery, ground, loom, alternator but can't see why it is not working fine.
starter goes well everytime i put a direct feed on it.
any idea??
As Stu says, it seems your MFRU may be too far gone. You can replace the MFRU - there's one in the for sale section. alternatively you can by pass the MFRU completely, replacing it with a new relay. You will find details if you do a search.