You can also connect the orange wire to +12V and the green wire to the CR125 signal wire and trigger it that way which results in the issue these cars were having. I always assumed that the caravan module was putting out a square wave of this magnitude but after actually using my scope on Paul's car I found that it was only a 0.65 volt square wave, not enough to trigger the isolator. To trigger the optoisolator we need a decent voltage difference between the two, normally either 5 volts or 12 volts. Those two wires make up the trigger circuit that fire the optoisolator on the board, orange being positive and green ground. The issue with the cars revolved around the FIP rpm signal circuit consisting of an orange wire and green wire, pin 2 and 24 respectively on the db25 connector. I went to do some forensic analysis of this issue this morning and found out something worth documenting here.
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