Wire Identification
The problems
surf club |
| low resistance problem |
|---|
problem #1
The first problem is isolation. Suppose we are trying to figure which wire is the top green one (wire #13-9). If we clipped one probe of our tester on a wire and checked for a connection to the replay reset relay (where on the replay reset relay we will look at later), we might get a false positive reading.In this circuit, both of the green wires connect to the replay reset relay. wire #13-9 does so directly, and it would measure zero ohms on an ohmeter. Wire #41-6 connects through two coils (each of which have around 5 ohms resistance). If the replay reset relay happens to be in the position where the switches are connected along the orange path (which in this case, with the power off, it is), both the green wires would appear to be connected together if you were using a continuity tester even though they are disconnected from the replay register zero switch, which is the thing that should connect them at the right time.
The solution is to make sure that the replay register
relay switch is not connected anywhere else. This
is where business cards have a second use (the primary use
being tossing them in the free drawing bucket at the
Liquor Barn). All you need to do is stick a hunk of paper
in between the switch blades to make sure the switch is not
connected anyplace else, and you've isolated the wire end.
problem #2
The second problem is the two wire problem. In this circuit, we see that the bottom green guy (wire #41-6) is actually connecting together three things:- replay register zero switch
- replay register reset coil
- replay reset relay switch (the thing on the left with the text chopped off)
That means that one of those three points will have a double wire on it. Which one is a matter of manufacturing convenience and physical location of the parts being wired together. There is no way to tell from the schematic.
Now let's go into the gory details of what to do.
