I had to rebuild the harness side of the relay for the fuel pump and now I can't figure out the wiring that goes to the four pins on the relay. What color wire to which pin? I've got two large wires and two small wires.

I'm not sure on the colours for that one, but you can be Sure How to Wire a Relay by Followin' this Writeup:

 

http://www.ultimatesubaru.org/forum/showthread.php?t=90403

 

I Hope that will be Helpful.

 

Kind Regards.

out of the '90 loyale manual:

 

fuel pump relay (blue) lock tab on top

BW BW

LB LW

 

 

L=blue

B=black

W=white

 

 

I think it should be the same colors on yours but when my relay went out I found out that someone had already replaced it with a different colored relay and different colored wires which made the job take a little longer to figure out.