Voltage problem

Hello FABO community I’m having a problem that won’t go away so I was seeing if I can get someone input on this, my alt gauge his crazy when I press on the gas I have already changed my alternator twice and my VR twice once I changed them both the second time it stabilized and stayed in the middle even with high beams on and flooring it!! I’m fairly new to these cars, so I was reading around read a comment about disconnecting the VR and if it stabilizes that means the cables and alternator are good I did that and it did stabilize, so my question is, is it just these cheap VR’s?