[JSeery]

Here is one set of the diagrams. Looks to be starter mounted switch. Would appear to me it about has to be the generator not functioning properly or the wiring between the generator and the ammeter has an issue. If it is wired per this diagram you could place a jumper across the ammeter and elemi ate any problem there. But if the ignition and lights are working that is most likely not an issue. From your original post it appears your car may be wired differently than this set of diagrams.