What wire on the ECU harness would be +5V?
There may be more then one 5V+ lead, [or less the 12C+] at the ECU/ECM, that is why it is not a good idea to probe ECU/ECM leads with a 12V test light, the 12V bulb will draw more power from one of those “low current” leads then it can supply blowing the circuit.
Why do you need to know?:stare:94
To ECT module for the S2000 cluster hooks to +5V only, 12v will fry it.
I will not be using a test light but rather a multimeter.
Anyone?