Reinstall the back plate,reconnect your battery,and off you go with a nice cool amp.(If you have a yellow wire on the fan too,you can cut it off and wire nut the end,or just leave it as is and tuck it under the amp out of the way.

I have 2 hours (maybe longer but i only tested this long)at full 600 watts instead of 20 minutes now.

My fan happens to have red leds so i took a night pic so you can see it working.

Hopefully this will be helpfull to someone.

Good luck