Breezy_Pete

Actually VAG will say, yes of course you can order an 06F903803B regulator; that'll be £116.16 including VAT. Oh, and different brands of alts do tend to have different part numbers or suffixes. Not sure on compressors but would suspect the same to be true.

Any chance it has ever been mis-fuelled with petrol?

I'd tend to disagree, based on this graph that I made a few years ago of the coolant and oil temperatures and oil level during a short journey and then for a while after shutdown, out of curiosity. 2003 Polo, BBY engine. The data is available on that car, but yes, couldn't vouch for the accuracy, although it tracks the coolant temperature quite believably. X-axis is time in seconds, I reckon.

It used to work as a link, I think.

Membership Options (Freedom) - BRISKODA 👍

Yes.

I think it's one of these VW AUDI Mk1 Mk2 Golf 1 Single Pin Connector Plug 357972771 JPT Starter Motor | eBay

There's a * note on the circuit diagram for that fused feed saying 'according to equipment'. I wonder if your car doesn't have this feature (perhaps due to RHDness?), and the fault reader has incorrectly picked it up. If you send me your VIN I may be able to dig into that.

I was referring to fabdav, but never mind. 😁

I wonder if there's even a thermostat or water pump problem too. Not sure I'd expect overheating in London at this time of year even without working fan.

Unwise to let it get to such a low state of charge in the first place.

I meant the genuine VW-Group part number, in the same sense that the genuine (VW) part number for your whole alternator is 06F906023F, as seen in your photo. I could work out the correlation via a couple of pages in the parts catalogue, 'alternator versions' and 'alternator and single parts'. Two points of interest now that I'm looking with morning eyes on a larger screen. "Made in GB" on the main part number label. 😲 And just above and to the left of the barcode you can make out some of the Bosch part number info of the regulator/brushpack itself, I think. BR14 - H, and then below that F 00M 145 316, possibly A different view might reveal all of that latter bit, which is how Bosch identify their brushpack/voltage regulators in detail. Be careful if you do try to change it in situ; the thick output cable connected to B1+ is fused, but it'll be a fairly heftily-rated strip of metal, so if you forget to remove battery negative first, and short that to earth, there will be a big flash and crackle before that fuse pops.

@colinstubbs that strip fuse is only used for the full speed of the fan(s), which I would really not expect to be invoked in the UK recently, so I would say that there is another as yet undiscovered fault relating to the low speed fan function. (Fed by one of the blade fuses - a 30 Amp one - in the adjacent covered section of same fuse tray.) There is a common fault with loss of low speed function, associated with an internal wirewound resistor, but check the blade fuse first. It's my bedtime now, more tomorrow.

I think the regulator for that alt has genuine part number 06F903803B. That may help you to cross-reference it to a Bosch part number.

Received, yep. Reply heading your way shortly.

Only those with start/stop and its associated different battery types and charging system, I believe, which I don't think is all from that date.

Clearly both codes were fitted to Polos in different years of production. I see no reason to doubt the OP has/had an AEY in his/hers.

Sounds like CTEK have cheaped out a bit on their output cable thickness (or copper quality).

Fair enough but I'm right about the earthing, right.

Or to put it another way, when the button is pressed it earths a 12V signal from the BCM, a 12V that won't be there if the BCM is asleep cos the car is locked. 👍

I missed this post Ian, sorry. Give me a shout by PM if you need to.

...and you're still going for the bait...

Nice find. 🙂

Check for corrosion on the pins of cabin fuses #1, and #16.

Does the battery symbol illuminate when you switch ignition on and all those other lights appear?