I'm having an issue with this idiot light not turning on when it comes to starting the car. This is what I've done so far. I place a test light on D+ of the alternator and it does turn on and then off once the car starts..So the alternator works. I traced the blueish wire all the way to the connector behind the instrument cluster, again, with the test light it works.. Next I swapped the idiot light with a known working light and there was nothing wrong with the idiot light.
took the whole cluster apart and analyzed the traces on the circuit board and applied + and - voltage and the idiot light does turn on. I followed the trace from wire connector socket to the bulb and then it goes back to the same wire connector socket. So I looked at the wire connector and see that it the return trace matches a green wire on the wire connector. So basically. On that same wire connector behind the cluster, in comes in a bluish wire goes to the idiot light and then returns to that same wire connector to the green wire.. But this green wire has + voltage with the ignition on and so does the bluish wire. So the bulb is receiving + voltage on both sides which is why it's not turning on. It use to work.. open to any input ...This is an e30 turbo s50 m3 btw..Thanks..
took the whole cluster apart and analyzed the traces on the circuit board and applied + and - voltage and the idiot light does turn on. I followed the trace from wire connector socket to the bulb and then it goes back to the same wire connector socket. So I looked at the wire connector and see that it the return trace matches a green wire on the wire connector. So basically. On that same wire connector behind the cluster, in comes in a bluish wire goes to the idiot light and then returns to that same wire connector to the green wire.. But this green wire has + voltage with the ignition on and so does the bluish wire. So the bulb is receiving + voltage on both sides which is why it's not turning on. It use to work.. open to any input ...This is an e30 turbo s50 m3 btw..Thanks..
Comment