My battery will not charge even after installing new alternator

What is your question?

My 2004 honda civic has a charging issue at low rpm and was only charging sometime at high rpm. when i turned on and off the lights or hit the brakes hard it would start charging again for a few miles. I have changed for new alternator that tested ok and battery tested ok as well. Changing alternator did not fix the issue and all fuse are ok. I re grounded the battery to the engine and engine to the body since its an old car with regular canadian rust. What else could i have missed that i should look for?