Let There Be Light Again! (For Now)

Lisa was sufficiently troubled by the Astro's lack of marker lights that she got out the shop manuals, looked through the wiring diagrams, and had me do some searches on how one would replace the headlight switch. Late into the night, she decided to go out and check the fuses again. She wiggled it but did not remove it; no change. She tried the switch several times, and suddenly: lights!

The marker lights are working again. However, this seems to suggest that the switch is on the point of failure, so we have ordered a new switch (which claims to be US made and we've paid a premium for it). The next question is how to replace the headlight switch on a 1989 Chevrolet Astro. The videos that we've found on this so far are either for a later model with a different dashboard layout, are for a truck, not the Astro van, or in one case is just a video of someone doing the replacement without any pictures of what he was doing. We'll keep looking.