Okay, so it that make the dash lights go as bright as they should be then take it? Well this is what ive done, replaced battery thats fine, cleaned battery to gearbox earth cable even though that was fine anyway. And new starter.

Its odd, the starter is brand new.

And nope no wired get hot at all.

Ive got personal thing might be alternator, the lights go brighter when i accelerate too, and they go dim when i put the fans on.