duster 73 turn signal indicators wont light up

I would lean more towards problems right at the cluster, sockets, bulbs, dirty contacts at the bulb PC board connections, or damaged PC board connectors. I don't think there's a 'ell of a lot to go wrong with the wiring, unless you have the wrong harness somehow, and I cannot imagine what they've changed in the harness. That tan / light green color combo has not changed in hears.