RA3 won't get a high level.

[mister_e]

I think I am limited to the ones MPLAB offers ?

Yes, you're limited to what's in the .INC file of your PIC.

How can I support you in doing so ?

Well if the simple TOGGLE PORTA.3 loop don't work, you have to fix it first. Trust me it's working here.

Additionally most settings are set to work in most cases so do you suggest focusing on something special for this issue ?

Well depending what you call most case.. but me, i use around 50 different PIC model and i have thousands PBP code examples, templates, projects and includes store in my computer. So... how on hearth can i remind what i'd set in all of them and how the hardware is set-up on board... I can't even predict what i'll do next time. This is why i always comment the default config fuses and set ALL of them in my code. One day if i have to modify it, i have only one place to check.

Same rules apply to the other thousand code example on other microcontroller brands and other compiler i also use.