Diesel truck won't start when hot?

I've got a 2005 ford f350 6.0 turbo diesel, and it starts fine when cold but won't even hit when it's hot, I have to use starting fluid to get it goin. Even right after I shut it off. We have replaced the ICP sensor already. Any help will be much appreciated.
-thanks

Clean the battery terminal positive and ground then check the wire to starter if any have had acid on them change them because the wires heat up and spreed a part losing voltage

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