My amplifer will cut on and off between on and protect.

Protect mode is a good thing but frustrating as well.... KISS keep it simple stupid... 1. good solid ground 2 amp, closer better 2. good steady 12volt current reading, some amps will go into protect mode when starved of juice... 3.one wire at a time left sub neg. right sub neg. 4.again one wire at a time left pos.right pos.... ALL WIRING TO BE ONE PEICE UNBROKEN AND CORRECT AWG...... dont bridge anything out or go crazy until this very basic and to the point way is working for you.. ull drive yourself crazy make sure of no reverse polarity.. very common mistake....

Try with one sub at a time to see if bad sub