Hi guys, ive got a 98 300tdi that seems to be playing up ever since it got a new battery ( could be that? ) ive noticed after a full charge over time my battery loses charge, or so it seems. It starts with my fuel gauge not showing a full tank when it has a full tank, the more electronics i turn on in the car, i.e radio, headlights, indicators etc. the lower the fuel gauge goes, i cant figure out if this is an issue with the alternator not charging, the battery being a dud, or my uncle said something about potentially a faulty earthing wire? was hoping someone could help nail down what it is before i go buy a new version of it haha, also if its the alternator does anyone know how much hassle it is to install an aftermarket uprated one? and if it is worth it.
cheers
john