I am using an Arduino Uno with a 4 relay module (found here: http://www.amazon.com/JBtek-Channel-Module-Arduino-Raspberry/dp/B00KTEN3TM?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_detailpage_o04_s00) and an Adafruit CC3000 WiFi breakout board. However, once I connect the power source, the board just constantly cycles on and off, e.g. about 1 second per cycle. Could this have to do with too much current being drawn? Or that the current output of the digital pins isn't enough for all of the relay inputs? I'm new with this, but I am sure all of the pins are appropriately connected.

EDIT: If I use the USB connector (5V 1A) instead of the external power supply, I can connect up to 3 of the relays without problem, but the 4th causes the board to reset. Any ideas?