Fuses issue

IMHO 20 amp might not be enough.

Most of the cirs have a 20 amp fuse on their own.

You need to check the current draw on the red or black wire with every thing on, headlights radio doors open brake lights pressed etc, etc, etc.

Then you will see how close to the limit you are running those fuses.

If the total draw in only 10 then maybe a slow blow fuse. They can handle an in rush of current much higher than the rating for a few seconds