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Message: <blockquote data-quote="midlife" data-source="post: 393030" data-attributes="member: 816">The convenience harness has 2 male plugs: one for the seat back release with a thick wire, usually black, and the other for the seat belt light/relay system (thinner wire). The thinner wire plugs into the 3 prong plug coming from the fuse box; the thicker wire goes to another yellow 3 prong plug coming from a power line coming through the firewall and attaches at the other end to the battery side of the solenoid. Your picture appears to be the latter (firewall) power lead.I can hear the video but I can't see any pictures, so I can't tell you what's going on. If your passenger side courtesy light comes on but not the driver's side when you open the driver's door, then you probably have a faulty connection at the bulb/socket. Each year (71,2,3) has slightly different wiring for the courtesy lights. IIRC, the 73 underdash courtesy lights have a separate harness that starts on the passenger side and runs to the driver's side and stops, but may have outlets for door lights (option). If this is correct, then you may have a broken wire between the passenger and driver's side bulbs.</blockquote>

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