Wires no 17 and 18 are for the low and high beam on the headlights. Wire no 91 at the headlights is ground. Make sure the headlamps are wired correctly and then check for continuity from the terminal at the hi/lo switch to the wires at the headlamp.
At the hi/lo switch, you will notice that one of the three holes is ribbed on the outside. This is the hole where the power (hot wire) should go into.
Unrelated to your problem, but it was common for the drivers to cross the wires at the headlamps during replacement of a bulb. If a headlamp wire no 91 is not wired to ground, you end up with a very dim headlamp bulb and a hi beam indicator lamp that will not go out completely on low beam.
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