g'day all!

As the title states I have a 1.9 mi16 that has its alternator light on all the time and bright. I changed the alternator 3 times. On the last one i discovered there was no power going the regulator. I then ran my own wire which gets power when the ignition is on, could this wire enterfere with the battery light? I checked the alternator and its charging at 13.87 volts!
I'm not sure what to do with it and dont want to just pull the globe out!

Cheers Chris.