is my alternator going?

hi guys.

I've tested my alternator with my limited electrical skills and for the following readings

no load

under load, all heated seats lights fans

If it's dying I want to be ahead so I'm not stranded.

Thanks for reading

high 13's should be fine, switching everything on will always make the alternator struggle

thanks Vocky,

had 14.2v in my mind as an optimal number for a working alternator.