[Schurkey]

Father-in-Law just bought a '77 Trans Am. I bought a '77 Pontiac service manual (the official factory manual, not a dumbass Haynes or Chiltons, and not a "reprint") from eBay. I'm pretty sure it's genuine in that it has shop wear, fingerprints, and it smells like carb cleaner--the kind that comes in a five-gallon bucket with a dip basket.

So far as I can tell, the car was originally equipped with a high-speed blower relay, screwed to the heater/AC box in the engine compartment. It appears to be factory-original; with an old and brittle wiring harness that seems to be Genuine GM. The heavy red wire that powers the fastest blower speed via the blower relay was disconnected; some of the wire is missing. This red 12-gauge wire plugs into the high-speed relay at a multi-wire molded plastic connector. The wire is about 2--3 feet long, and ends with one side of a molded plastic connector and a spade terminal. The other part of the wire is either missing or hidden; I can't find it.

Problem is, the factory service manual doesn't show the high-speed relay at all! It also doesn't show the capacitor (for noise suppression???) that is right next to the blower motor under the fender.

Does the factory service manual have a mistake in the wiring diagram???

Where does the red wire from the high speed relay connect to + power??? I'm betting it connects to the alternator + terminal--but I don't know for sure, and I don't want to connect it to always-live power if it should be connected to power through the ignition switch. I'm also wondering if this wire should have it's own in-line fuse or fusible link. I'm guessing it is NOT intended to be protected by the existing fuse in the fusebox--but--I could be wrong.

The wiring under the hood of this car looks like a High School Shop project gone wrong. Unbelievable. I can fix it--but it'd be nice to have ACCURATE wiring diagrams!

Thanks for replies!