I had my first breakdown after 9 years of Alfas this weekend, on a trip to Perranporth in Cornwall about 2 miles from getting there the dash lit up with warnings, abs vdc hill hold etc etc not available so I kept going, as I pulled into the hotel I could hear it was ticking over a bit fast, parked up, turned it off and then tried to restart but nothing..
Full of doom and gloom and not having any breakdown cover and not relishing paying to get it recovered back home I at first thought the alternator had failed, belt was still on and the bottom pulley was still intact but after thinking about it when I tried to start the dash lights didnt dim as they should with a flat battery I thought about the earth lead but couldnt see if it was ok but sure enough with a jump lead between the negative terminal and the engine block it tried to crank but the battery had gone too flat to start it.
luckily the hotel had a booster pack I could borrow, so with the jump lead cable tied in place and with the booster pack it started and after running for half an hour the battery was charged again with no warning lights..:O)
I've just done the 200 mile journey home with the jump lead still in place with no problems.
So.. next time you have the under tray off.. check the condition of the earth cable, I guess its underneath somewhere, I'll know more tomorrow when I fit a new one.
On a side note, Perranporth.. lovely place..