I Changed the alternator in my 2017 honda fit with aftermarket alternator and now I have 3 lights on... power steering traction, control and tire light And the text reads charge system....I didn't have any lights before... any ideas before I take it back out and get a oem alternator from honda for another couple hundred dollars? 🙏

 

Check your electrical connections (plug and bolt-on wire), make sure all the mounting bolts are tight.
Is it a remanufactured alternator, or "new"? Does a scan tool give you a specific error code? Was the previous alternator doing the same thing?

 

The alternator is a carquest remanufactured for 500+$ and the old alternator was making a grinding noise but I had no lights on until I changed it.. only got one code

 

Do you have a multimeter?

 

yes i got a crappie harbor freight cheap one

 

Measure voltage from the bolt-on terminal of the alternator to the engine block. It should show battery voltage at all times.

If that checks out, unplug the 1-wire connector from the alternator and the connector from the battery sensor (the block on the negative battery terminal). Use diode test (safer for electronics) to check continuity on the light blue wire between the two connectors (which is also connected to ECM pin A26).