I bought a '62 Chevy longbed stepside that had about a dozen extra lights (interior,cab markers,side markers,road lights,extra tail lights) added in,some connected and not working,some not connected and one that actually worked. When I got under the dash,I was horrified to find ALL the accessory wires fed (stripped,wrapped around and twisted-NO tape) by a bare copper romex ground wire from the battery through the firewall and across the whole under dash to the lights switch,strategically bent to not short against anything!
this truck was owned bt a 68 year old man who drove it 45 miles on the freeway every day this way. Like was described elsewhere,I removed lots of wiring,replaced almost as much (the dash lights were wired with speaker wire) and finally got it safe and functional. Then the guy told me the Title he was waiting on wasn't gonna happen,and I had to sue him to get the purchase price and my labor for the rewire. Two days before Court he showed up with a car trailer,paid me the $1200.00 in cash and took the truck back. (It's still sitting in the yard of his shop after 2 years.
The guy is NUTS!