Previous thread lost over weekend.
A couple of people came to my assistance and posted links to very helpful wiring diagrams for '67 G20 Chevy van.
To recap, briefly, I had just replaced all the plug wires (they were too short and were getting baked on exhaust manifold). Found the heat riser valve as stuck fast, as well. Freed that up, van started up nicely. Then I turned on the headlights and everything died. Found melted orange wire running from light switch. It apparently had shorted out before, since there was some tape on it in an effort to insulate it again (exposed and oxidized copper showing). I clipped the wire at the switch, and after a while the power came back on.
I'll probably be running a dedicated, separately fused line for the dome lights in future.
Anyway, thanks to those who posted the links to the wiring diagrams.
A couple of people came to my assistance and posted links to very helpful wiring diagrams for '67 G20 Chevy van.
To recap, briefly, I had just replaced all the plug wires (they were too short and were getting baked on exhaust manifold). Found the heat riser valve as stuck fast, as well. Freed that up, van started up nicely. Then I turned on the headlights and everything died. Found melted orange wire running from light switch. It apparently had shorted out before, since there was some tape on it in an effort to insulate it again (exposed and oxidized copper showing). I clipped the wire at the switch, and after a while the power came back on.
I'll probably be running a dedicated, separately fused line for the dome lights in future.
Anyway, thanks to those who posted the links to the wiring diagrams.