Hi, I need some help diagnosing a serious electrical problem with our car, a 1990 320iSE. For a couple of weeks, the headlamps and dash lights have been flickering intermittently whilst driving, and last night the flickering got worse, and the blower motor started slowing and revving repeatedly. The fluctuations aren't particularly related to revs. As i pulled into the car park (about 9 miles later), the engine cut out, and there wasn't enough power in the battery to turn the starter, so it had obviously been draining rather than charging. Had to get a recovery van out, who leant us a power pack to get home on (still flickering). He connected a multimeter across the battery with the engine running and reported that it was charging to some extent, but that the voltage was jumping around all over the place.
First thought was that the alternator/voltage regulator must be dead, but I also fear that bad wiring somewhere could be responsible? Before I start dismantling things and buying expensive parts is there anything else I should test or consider?
Thanks!