PA28181........... What is wrong with a map compass and stopwatch ?
Nothing.
As for getting a french mechanic to do all that fault finding and then supply and change/test the alternator (If thats what it is) When I was stuck at Perigueux with a broken carb heat cable it took two days to get sent to Toulose then couriered to Periguex and the rest of the day to fit it.
Charge up, start up, take off, master off, land at base. Dont fanny about waiting for fault finding.