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That contactor going bad is a fairly common issue, post a picture of the data tag on your PCB box as it may be on of the ones that should be replaced because of its age. You will eventually have issues with the rest of the box but might get a few more years out of it, there are other options...

Remove the PCB (EESS) box and open it up there is a contactor (solenoid) inside that LOOKS the same as used for many starter (edit and winch) applications, it is 24V and should be rated at 100A AND continuous duty, do not cheap out on this part buy a good brand name contactor. The heater fan...

Figure out what the issue is first, if the only problem is the relay it can easily be replaced, if the EESS box has other problems (IE glow plug control issues) then a replacement manual box is one good alternative, Milcommoguy sells one

When it is not charging turn on the heater fan and see if it is working, if not it is likely the EESS (protection) box not feeding exciter voltage to the alt. There is a relay in the box that does that and they can go bad. It is normal for the alt to delay after starting it is called soft start.