Testing operation of 70-73 Safety Belt Warning Light Options

[doug_b_928]

I'm trying to determine if my safety belt warning light is good. It's from a 73. The car is completely disassembled, including the wiring harness. There are 4 wires that go to the light. On the back of the light are 4 contact points, one for each wire. When I put power and ground in various combinations to the 4 points, I can only get the light to illuminate when the ground is on the left-most contact point (where the yellow wire goes) and put power to the second contact point from the right (where the black wire goes). Does this sound like the correct operation for this light, or should other power and ground combinations also cause it to illuminate? If no one knows for sure, if anyone has one they could test I'd appreciate it. Here's a pic of the only combination that will illuminate the light.