Test your pedal only with a battery to rule out a ton of issues not pedal related.
Batteries cannot produce noise thus eliminating all power supply related issues.
Only test the pedal by itself to rule out several other issues.
You can connect a battery to your pedal using your 2.1mm connector attached to a battery strap but be sure it is wired correctly so that it is Negative Tip.
This is an excellent tool to always have handy when troubleshooting.