its not hard buddy, they just burn up, the first one i did abuse it a little but the last 2 just went out while driving they werent even hot.
everything is installed exactly like mini truckin mag had wrote up, im using 4Ga. wire as well.
it cost $10 to ship it back to AZ directly,
http://air-zenith.com/ is their website and the number is 7022707988. they sent me a new one everytime i returned one. if they could fix the bugs these compressors would be rad.