Hey guys and girls haveing problem with blobeye Impreza the engine management light is always on (might not come on on the off chance )but it doesn’t turn off once car is started and have plug it in and it’s comeing up low voltage This has started once I replace old crusty battery with new one that is supposedly right one for car 

When you say plug it in , was that a code reader That said low charging system voltage ? 

Could try cleaning alternator plug  and engine /battery earths. 

Could be a faulty alternator due to working too hard trying to charge the old knackered battery.  

Halfords do a free battery alternator check , might be worth a go to rule it out .

12 hours ago, Davidblobeye06 said:

Hey guys and girls haveing problem with blobeye Impreza the engine management light is always on (might not come on on the off chance )but it doesn’t turn off once car is started and have plug it in and it’s comeing up low voltage This has started once I replace old crusty battery with new one that is supposedly right one for car 

Keep your side lights on all the time (they turn off with key out) see if that helps. Alternator voltage sits a bit low with them off for some reason. 

I changed altanotor as it was over chargeing but light still there side light not helping yes it was code reader have cleared code few times and just keeps comeing back 

I had a Vauxhall 🤐 that burned a resistor in the back of the dash ,due to the alternator over charging at 18.8v .So there might be a resistor , fuse ,relay ,ECT also in the charging system too .

Have you used a multi meter to check the charging system voltage both off load and full load?

Everything is working way it should no blown fuses etc it only started comeing on since I changed original battery for a new auto parts one don’t see how this should of made worse but have crossed off everything else even wire brush all earth wires that I could see