It could be bad, try running a wire from the positive battery post to the post/connection that activates the relay and see if power gets thru that way, I believe the wire is white/blue but yours might have a short green wire connecting to the white/blue wire, if it doesn't work then(power on both sides of the relay) the relay may be bad.
If it does make it work and you cannot trace that white/blue wire back to figure out why it is not supplying power when you turn the key on then that post is what you would connect your button to.
I will always try to figure out why it's not doing what it is supposed to do before by-passing it, I want stuff to work the way it's supposed to work, and you learn as you do this kind of stuff.
I checked all that this morning. Everything is plughed into the relay and the white wire opposite of the red/white wire does have power. And the two plugs under the dash are plugged in. Wouldnt that mean that relay has gone bad?
Update on my car...got my jdm front end on. Rear bumper brackets are being fabbed now. Got my fender mirrors on and my turbine wheels with new rubber. The car is coming along nicely. Next on the to do list is install my Weber carb and do a smog delete, wire up my tach, cut a coil on each corner to drop it a lil bit and new 2 inch exhaust. Also have to install my new stereo headunit. May put it in the glovebox
Are these for your 79 Datsun 720?
I have a set of them aftermarket Bumperettes, they are not the best quality, but I would use them if I needed a set, you will have to make a set of brackets to mount them.
Also shipping is unknown, so you might be able to have them shipped to you directly from overseas.
I can take photos of them if your interested.