Starter switch gone out?

[J-440]

 Evening boys. Ok, here's the skinny. Went to change my wire looms from the starter relay to the firewall (I moved the stock relay to the front of the car from the firewall). As I was doing that, my lower driving lights were flickering and so were my interior lights and I was hearing a clicking noise from the front of the car somewhere near my headlight conversion relays. Then I lost all power. Car won't start and electric fuel pump won't turn on. Battery has a full charge and like I said earlier, I'm getting power to the big terminal on the starter relay. The smaller terminal on the relay with the wire leading into the car has no power though. I've checked all fuses and pulled my ignition switch to see if all the wires are connected and I'm good. I even swapped out a new starter relay and nothing.
  Back to the "clicking noise" up front. Would a headlight relay cause all of this? Or do I need a new ignition switch?
Thanks for all the help as usual. Y'all have a good one.

[John_Kunkel]

Does the car have a fusible link? If so, check it.

[70 sublime]

Does your car still have a big red wire that goes through a block conector on the firewall to feed the main wireing harness ?
Check that conection also 

[b5blue]

Wiggle the shifter while cranking. Check the + battery lug to wire connection, some were made loose fitting. Check grounds. Do you use a meter?( Look for voltage drop.)

[J-440]

 Will do. Thanks for the input guys. I'll be at it on Monday.

[J-440]

 Big John Kunkle. You hit it on the head. My fusible link connection came loose from the starter solenoid wire to the fuse box. Thanks again brother!

[Nacho-RT74]

Be sure it comes tight and clean again on BOTH ends... that's one of the MAIN circuit sections of the car, as you noticed. Including protection from fire