Your alternators are fine, no need to get excited about that.
And if you need to pull the heads off its a great time to upgrade the gaskets to something that will stand up to some boost for when you put a 6.5 turbo on it.
There is a guy selling (2) 6.2's and (1) 6.5.... I don't know anything about the engines because I have to call the guy today. I like the 6.5 upgrades....
Need some pictures here, but could be a gas. Subscribed.
I replaced the Radiator cap, replaced the thermostat, I had to make a gasket because advanceauto said that it was discontinued... Things that I noticed while replacing the thermostat, the radiator side of the thermostat (coolant) was orange and dirty, the old thermostat would stick open from time to time, the engine side of the thermostat (coolant) was bright green. I emptied the radiator and replaced with fresh coolant. I fired her up, got the engine warm and drove her around the block at decent rpms. I pulled into the driveway popped the hood and noticed that the top rad hose was "bloated" (pressurized)... Bubbles in the overflow, The heat in the cab was warm at best. Even the heater hoses were barely warm. The only part that was hot was the coolant crossover.
I might replace the water pump but, I'm thinking combustion gases are getting into the cooling system. There is No oil in the coolant and No coolant in the oil. She's not puffing white or blue smoke... If the water pump doesn't do it then I'm going to pull the thermostat and cut out an air restrictor to put on the front of the radiator and then I will monitor any changes. ****, if I can't get the motors for a decent price I'll be half tempted to toss in one of my race motors... lol.
Side thought, how does one test for hydrocarbons in the coolant?