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biffa75 · 20th January 2022, 12:03

Still not arranged to meet with big Russ as yet due to other commitments.
However tried a new battery as the old one was old and undersized. New battery an 096 unit. Abs and brake fault appears for a few seconds and then goes away.. worse when Raining.

So.. got the multimeter out today, car pared up over night. Battery vtage shows 12.5v
Starting up (rear demister possibly on) check voltage again. 14.9v

So.. having a quick Google the BMW E46 forums, shows other people have experienced over charging and this can bring on abs and brake fault and transmission fault warnings etc.

My question at this point is... Would you expect the alternator on a car that has been standing overnight and so only started, idling would you expect the voltage to be 14.9 or... Could this be a sign the regulator is packing up? Could a too higher voltage really cause the abs and brake fault to flash up. If so... Why does rain make the issue worse, I tried to replicate the issue with the hose pipe and It would flash up with the fault.

Thanks
Rob

20th January 2022, 12:03	#12
biffa75 Trader Mk1 2004 tourer cdti + MK1 2003 Saloon CDT Join Date: Nov 2015 Location: west yorkshire Posts: 495 Thanks: 106 Thanked 91 Times in 57 Posts	Small update/question Still not arranged to meet with big Russ as yet due to other commitments. However tried a new battery as the old one was old and undersized. New battery an 096 unit. Abs and brake fault appears for a few seconds and then goes away.. worse when Raining. So.. got the multimeter out today, car pared up over night. Battery vtage shows 12.5v Starting up (rear demister possibly on) check voltage again. 14.9v So.. having a quick Google the BMW E46 forums, shows other people have experienced over charging and this can bring on abs and brake fault and transmission fault warnings etc. My question at this point is... Would you expect the alternator on a car that has been standing overnight and so only started, idling would you expect the voltage to be 14.9 or... Could this be a sign the regulator is packing up? Could a too higher voltage really cause the abs and brake fault to flash up. If so... Why does rain make the issue worse, I tried to replicate the issue with the hose pipe and It would flash up with the fault. Thanks Rob