Alf the Alphard

Please could I get some advice..... 2007 2.4 AH10 So you've replaced your alternator twice, changed the 140amp fuse, checked every fuse and earth and changed the battery, tested multiple wires and connections with a multi meter and your charging system is still not working.....🤬 Then you notice that the battery dash light, indicators and reverse lights don't work, and you start researching if a faulty battery light will stop the alternator charging. You take apart the instrument cluster to find that the led's are all part of the circuit board and wonder if a 2nd hand board might work.... Can a faulty battery light stop the alternator circuit from charging? Should I just try and get an auto electrician to try and solve the issue? I don't want to sell my Alphie but I am getting very frustrated with not being able to drive it. Any advise would be greatly appreciated!