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.

[JeffBowlsby]

You come up with interesting questions Doug. (IMG:style_emoticons/default/first.gif)

The seatbelt light you refer to (4 pole) is only on the 72-73 cars. 70-71 did not have them. 74-76 had a 2 pole version, but it functions differently than your 73 version.

The 'light' is more than a light, it is a circuit with an IC and diodes and more...

Item 67 on the schematic is the 4 pole light. You can trace the yellow wire to be switched grounds triggered by the passenger seat sensor and the door sensors. I have not studied the rest of the schematic to understand how to all works.