My money's still on fuses. Have you checked every single fuse in the fusebox with a multimeter or 12v tester? Sometimes problems can be caused by the failure of a fuse that's seemingly unrelated to the fault. There may be more fuses under the bonnet, and some Renaults have a lone fuse hidden behind the ashtray, though this usually feeds the stereo amongst other things.
The handbrake battery and
lights all take a 12v feed at the dash end and are earthed by their appropriate switches. In the case of the battery light, the alternator earths it when it's not producing charge and brings it up to 12v when it's running (making the light go out.) The fuel gauge will also be fed with 12v and grounded through the resistance of the sender unit.
The indicators, on the other hand, will be taking 12v from the flasher unit and grounding through the instrument cluster's ground feed. That would explain why they're still working.
I'm not sure about modern alternators, but older ones used to need the warning light on the dash to be working in order to begin producing power. If the car's been running like this for a while, then obviously you don't have a problem in this regard, but if it's only just started doing it, there's a good chance that the battery isn't charging, and you're running on borrowed time.