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I don't particularly want to skip having fuses, but I needed the wipers to work for the weekend, and I'm not entirely sure that then fuse panel is even wires correctly. There are so many cut wires and missing pieces and parts (presumably from when it was swapped from a 327 to a 250) that I'm a bit lost.
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Hello Hantke,
The bigger the current electrical mess--the greater the opportunity (and incentive) to re-do things better.
Good background info can be found at:
M.A.D. Enterprises
P.O. Box 675
Springville, CA 93265
(559) 539-7128
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Their tech. info, "CHEVY Main Electrical Power System 1963 thru 1971 Chevy" gets you started and has a photo of the Horn Relay Buss Bar.
For quick and dirty wiring the windshield wipers, when you don't know how the fuse box is wired, you can connect Windshield Wipers Power Lead to the Horn Relay Buss Bar--with an inline fuse installed in your Windshield Wipers Power Lead close to the Horn Relay Buss Bar. Follow M.A.D. Enterprises' advice about clean, tight connectors. This is quick and dirty wiring because the Horn Relay Buss Bar is powered whenever the battery is connected--leave the wipers on and the battery drains even though the ignition switch is off--not good. Now you have fused power to your Windshield Wipers Power Lead. Install a switch in the Windshield Wipers Power Lead. To get you through the weekend, almost any switch will do. If you have a 2-speed wiper motor and your switch only handles a 1-speed, pick the one speed that makes you happiest--this is quick and dirty, as in temporary. Connect the switch to Windshield Wipers Power Lead and Windshield Motor. Connect Windshield Motor to Ground. Truck manufacturers call sheet metal Ground. Trucks older than a couple of years don't. Spend your weekend enjoying your windshield wipers, not cleaning sheet metal to frame and frame to battery rust. (Take a few minutes to install a copper ground wire to the bolt securing your battery ground wire to your starter, or something similar. Don't just do a wire wrap-around--install a connector with eye, or whatever fits.)
Now you are good to go for the weekend.
Chevy has wiring (I call them connecting) diagrams in their manuals. They are a starting point. M.A.D. Enterprises discusses improvements--a big one is a better power buss bar than the Horn Relay Buss Bar--another is installing relays on higher amp. things like headlights and electric radiator fans.
There are better fuse boxes than Chevy provided. Lots of fuses, visible and numbered, shorten investigating time. Many working/cruising boats have good systems.
Regards and Hope this helps,
Culver