Folks, usually I can work these things out, but this has me stumped.
(See attached “schematic”)
This “circuit” is duplicated twice in the setup.
The two leds are used to indicate that the relays are active. These leds are in the switches/buttons.
Ok, the circuit is a stock 12v one. So 560 ohms would be the resistor of choice, but as it was going to be used in dark places, I upped it a bit to 680 ohms.
To make it easier to find the buttons to press, I would make the leds glow slightly even when not active. Thus the second 22k resistor.
So: All being good, the two leds glow gently.
The diodes are there to stop any leakage through the “bleed” resistor into the coil of the relay which is also turned on.
I push one button and it’s led glows BRIGHTER - indicating the relay is on - and the other led continues to glow dimly.
I release that relay and push the other button.
It’s led glows brightly, but the other led is now OFF!
Looking at the photo, you can see the two parts of the circuit. I have tried to highlight the two areas/circuits applicable and put lines showing the tracks and where/how the connect. Sorry if it is not the best.
Measuring voltage at the junction point of the two resistors, on both circuits I get 1.7-ish volts when off.
One circuit, it goes up about .2 volts when on. The other circuit does nothing.
When I do the “bad” one, it’s voltage increases by about .2 but the other circuit’s voltage drops by about .2 as well.
They are two completely separate circuits! I have checked for solder blobs, etc. But that kind of fault would cause the problem to happen both ways, not just one.