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You'd have to come up with a truth table for the various conditions that occur for the relays/outputs. I suck at this kind of logic but you should be able to do it with a few discrete logic elements and some transistors. Someone else here more familiar with relay logic would have to translate it into a truth table though. My mind just stops working when I see stuff like that =O
About all I can tell is that I and R are OR'd together at the S6 mark.
This circuit is obviously drawn with "Power On" conditions...
Relay 3 is powered "ON" when the clutch is in "what" position?? The switch shown is Normally Closed (N/C), but is this for clutch pressed or de-pressed??
In the current condition, relay 3 is on, hence the brake signal goes through relay contacts 30/87, then through relay 2's contacts 30/87 and then ends up dead at relay 1's contacts.
Let's for one moment assume that relay 1's contacts are also closed, the only path left for current to flow is through the -CC light. I assume this is a lamp, and that the other end is earthed, else nothing will happen ???