Thanks y'all. My husband seems to have gotten it operating again, at least it's toggling. We are going to put it back in and see if it works.
Wish we could say more for the brand new auto speakers we got him that were guaranteed to fit in his truck, but don't. Sigh.
Oh, and did I mention our heat pump is failing and needs replacing and that squirrels nested in our attic and had to be (humanely) removed and the roof repaired? It's been an expensive December. Having ONE THING WORK would help!