There are two fuses related to the dash and side lights. They are located
just above the 2nd relay from the right in the bottom relay row. Both fuses were blown,
or just one of those? (...and do you have AlfaControl? As I recall, no, but i'm not sure)
There's no relay involved in the dash and side lights supply.
You can try to check the correct operation of the light switch:
- you'll need a test bulb (12V / 10 to 21 watts)
- remove one of the fuses mentioned above (e.g. the upper one) in order to make the fusebox terminals accessible.
- connect the bulb between the chassis and and one of the fusebox terminals while the the light switch is on.
You can use the blown fuse to access the the fusebox terminals.
If the bulb doesn't lit try the the other fusebox terminal related to the same fuse. The bulb must light brightly,
until the light switch is on. You may repeat the procedure on the lower fuse as well.
If the bulb doesn't lit at all, the power supply of the light stalk switch should be checked:
- It's required to remove the "nacelles" of the steering column, in order to access the two four pole connector of
the stalk switch.
- On the stalk switch look for a connector with the thick, red wire.
- Connect the test bulb between this red wire and chassis. The bulb must lit brightly regardless of the switch state. If not, there's a wiring fault between the positive branch terminal board (behind the intermediate bulkhead in the engine compartment) and this connector terminal.
- Connect the test bulb to the yellow wire terminal of the other four pole connector and chassis. The bulb must lit brightly when the light switch is on. If not, there's a failure inside the stalk switch, probably the high current
generated by the short circuit caused permanent damage to the switch contacts. In this case further inspections
should be performed to find out what caused (or where is) the short circuit between the fusebox and the lights.
I hope this will help to start investigate the problem.