I've got an MX5 1.8 NB engine in my Vauxhall Firenza, I have swapped the original ECU controlled alternator for an NA non ecu controlled version, however I can't get it work correctly with the Firenza clocks.
There are 3 wires on the alternator:
1) this is easy its the feed to the battery
2) Grey/white, if I earth this to the alternator the revs drop and the vehicle starts charging at a steady 14.6 volts
3) Grey wire, this appears to do nothing but I think is voltage sensing wire as it always has a nominal voltage between 0.27-.0.51 volts when running or not running
The Firenza ignition warning light, works if this is earthed and goes out once voltage is seen, however this won't work as both wires on the alternator have voltage regardless if the vehicle is running or not.
I've looked online and think I have worked out how to wire up the alternator to work but not with the ignition light. Has anybody else come across this with another vehicle and how was it solved.
I can provide various readings as required.
Thanks
There are 3 wires on the alternator:
1) this is easy its the feed to the battery
2) Grey/white, if I earth this to the alternator the revs drop and the vehicle starts charging at a steady 14.6 volts
3) Grey wire, this appears to do nothing but I think is voltage sensing wire as it always has a nominal voltage between 0.27-.0.51 volts when running or not running
The Firenza ignition warning light, works if this is earthed and goes out once voltage is seen, however this won't work as both wires on the alternator have voltage regardless if the vehicle is running or not.
I've looked online and think I have worked out how to wire up the alternator to work but not with the ignition light. Has anybody else come across this with another vehicle and how was it solved.
I can provide various readings as required.
Thanks
