That old solder that Charlie had was probably flux [on edit - actually rosin, a type of flux] core, which is the right stuff to use for electrical connections. Definitely not acid core. I have to disagree with bartamos (and this time I'm pretty confident in my position ) about resoldering wires to that old Signal-Stat 700. They were way more robust than stuff you find today as far as the board where you're going to solder. Use a fine point soldering iron that gets hot quickly and carefully heat and pull the wires loose. Then after tinning the new wires, solder them in place.
LaPlace Transforms --- UGH!! I vaguely remember them, but still hate them. When everybody said that "I'll never need those again", with the exception of maybe a NASA engineer, that is completely true. I took a graduate level course in them way back when, and never had to mess with them again. I may still have the textbook if anyone is interested.
John, you may have to move some wires around in those relay sockets I sent you, since I screwed up the wiring royally. Or you could just remove the tags I put on. Moving the wires is pretty easy, just put a small screwdriver alongside from the relay end to release the latch and pull on the wire. They'll then snap into the right hole if needed.
Last edited by klhansen; 03/23/20247:16 PM. Reason: minor
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
) about resoldering wires to that old Signal-Stat 700. They were way more robust than stuff you find today as far as the board where you're going to solder. Use a fine point soldering iron that gets hot quickly and carefully heat and pull the wires loose. Then after tinning the new wires, solder them in place.
When everybody said that "I'll never need those again", with the exception of maybe a NASA engineer, that is completely true. I took a graduate level course in them way back when, and never had to mess with them again. I may still have the textbook if anyone is interested. 
