intro been driving BXs for 13 years now, only main car I've ever owned, currently in possession of 7 bxs, currently none are going

My daily driver has decided to have a rest, well it decided to have a rest half way up the Hume hwy between Melbourne and Sydney, for those that know the road, its long, boring and breaking down on it is an expensive exercise.
Car gets hot and cuts out, won't restart. Because it was dark, found the problem quite easily as moving some wires near the battery created great sparks. The wire that runs from positive battery to fuel relay had worn through and was shorting out.
Got the car back to Melb, fixed it, all good.....
Nah, still cuts out when it gets hot, double checked fix, all good, started investigating further a field, checked dissy and rotar, look ok, rotar could do with a sandpaper, but no arcing in the cap, plus it was replaced three years ago.
Moved on to coil, resistance increased significantly when hot, right new coil that will fix it, nah....
Found the narrow heat range where it cuts out, checked water temp sensor, removed them didn't change it, wondered if when the fans come on, it's creating a short elsewhere ... nah...
Running out of ideas, started down the cranke angle sensor route, however it's a tri with a be1 gearbox and a jetronic ecu...so nah...
Help, other ideas please, what else could have been damaged by the fuel line being shorted? Never had the problem before it stopped dead on the Hume.
Thanks
Gamila