One day your saying take it to auto spark, the next day, set fire to car.
Make up your mind, you would not be condoning arson
do what you like mate just thought you were selective reading and have just proved a point lol !!
im like most on here mate and dont like to see people waste money or be ripped off buying pointless thicker gauge wiring ,when it isnt going to sort the issue you have !!
you did mention being on a tight budget and ok with electrics to an extent , but i see when i asked in earlier post if you have multmeter etc and know how to use it , i didnt get a reply so assume your not capable , hence my suggestion to take it somewere that knows what there doing mate ..
advice is free ,but weather you are willing to listen and learn is up to you mate
and no i dont condone arson either but dont forget having dodgy car electrics is a fire waiting to happen in itself also mate ..
either way hope you get it sorted and good luck