Thanks Robin - I guess I was correct in my assumption that they both need to go to the positive terminal then.
Although... I don't have an inline fuse on either of them. Well, not that I recall seeing one when I was re-wrapping the loom. And there's no huge cable going from the battery to the starter bundled in the loom - there is one that goes from the alternator to the starter. IIRC, the cable to the starter was separate on my donor car. That's how I've done it on the Sportster (via a battery isolator key)
I wonder if it's because mine is an older donor than yours? mine was an 85/86 model, and I know that differences crept into the design around then. I ran into that when I rebuilt the engine, as it has different bearings to later models. And I've noticed that my diagnostic connector is different to everyone else's, and if your remember the ECU connector on mine is the same shape as the ABS control unit connector - which caused much confusion at the time.
