Engine starts fine cold, but when hot it will not crank. Where are the relays?

i don't believe any of the above, with the info supplied it sounds like the starter is binding up when it gets hot

ive had the same problem with my 1966 ford f100 what happens is the starter gets too hot while driving and fries the motor so try to replace the starter then if it still does it check the ignition system becuase sometimes if the ignition box gets too hot the wires will acculy fry and break apart so when its hot and expands its not touching that much