So the other day I notice that my positive terminal was loose and I procrastinated and my key light brake and battery light came on I changed my alternator but the key light is on again is their anything that I can do to fix this problem?

 

New battery?

 

no just the alternator It went off but then came back on

 

https://www.myg37.com/forums/g37-cou...-the-dash.html

 

Not sure why you procrastinated in first tightening a loose battery terminal? That would have been job one.
Second job would have been to replace the battery in your key fob to get rid of the key light.
Third job should have been to test your battery with a battery hydrometer to determine the state of charge of the individual battery cells. Any dead cells could possibly be a cause of the battery light?
Did you ever measure the alternator output voltage across the battery with your multi meter.?
Did you ever check the date codes on your battery to determine the age of the battery?
Was the Alternator ever bench tested prior to replacing it?
It is always preferable to rebuilding a factory OEM alternator that replacing a cheap one usually made in China by a local electrical motor rebuilding shop.
Just asking a few questions and offering my $.02 for some logical electrical troubleshooting.