My CQ just died on me a day ago. volt gauge dropped to 10 volts and battery light and brake light came on really dim, then went out. and came back on a couple times. It happened right after i washed my car, so im thinking maybe there is a short, or bad ground? Battery seems to be ok and holding a charge (12.6 volts) but alternator doesn't seem to be charging. so im hoping its that rather then a wiring nightmare. The lights are coming on very dim and kind of flickering which is making me skeptical its the alternator. But it does have 260,000kms which seems to be the usual life of a vw/audi alternator in my experience lol. Need Help!! anybody have any ideas?
Most likely it's voltage regular, remove it and look at the brushing. If very worn, replace it, also check the bushing on the shaft, if there copper on it, that good, if copper bushing gone, need a rebuilt or replace alternator. Also Check alternator cable for voltage drop, should be under .3 voltage drop with alll loads on. If it higher, clean terminals or replace alternator cable, also check grounds cables too.