Thanks Soundguy,
It is a 1968 diesel and I had fitted a two-wire alternator with a built in regulator a few years ago, using the original loom and it worked fine. Now I have done some work on the tractor and want to replace the loom as the old one is in bad condition. I bought a loom that is designed for an alternator but I think it is for one with an external regulator. I have figured out where some of the wiring goes but am not sure about some more. I have done a lot of searching but cannot find a wiring diagram.
It has the original ammeter and I had fitted a charge light but at this stage I am taking out all of the old stuff and starting from new, using the new loom and the two-wire alternator.
Any help greatly appreciated.
P.J.