05 Fabia 1.4 TDI. Will try with the 90 Amp alternator to begin with but I suspect it will be tight/limit the full power mode of the heater. Do you know what cars had the 110 Amp alternator (or bigger)? Seem to be a bit of a rare beast on eBay 

This all I can offer: LLLParts

Not sure why they truncate the first couple of characters off the part numbers, but guess they should be 03.  Edit, or maybe not always.  Could do with an ETKA expert, are you able to help @varooom?

 

The last one in that list (120A) appears to be 045 903 023A, and seems to fit your engine.

Edited 23 August, 20223 yr by Breezy_Pete

33 minutes ago, Breezy_Pete said:

This all I can offer: LLLParts

Not sure why they truncate the first couple of characters off the part numbers, but guess they should be 03.  Edit, or maybe not always.  Could do with an ETKA expert, are you able to help @varooom?

 

The last one in that list (120A) appears to be 045 903 023A, and seems to fit your engine.

No pressure then 😄

 

Attached is the full printout, the LLLParts links are actually a little weird, as the link tries to suggest illustration 903-000 is real, but reality in ETKA is it's UEB.

That asside for a moment, @Breezy_Pete is correct on that being a 120A and should fit.

903UEB.pdf

 

You will need to allow time for this task, as potentially you might need a new Alternator bracket, could be painful once you have torn old one out to find new one doesn't fit as intended.

Also worth checking the wiring gauge does not change also from one alternator to another, don't want to feed all that current down a thinner wire.

The wire from Alternator could be 16 gauge or 25 gauge depending on fitted equipment, mainly trailer, though could be other equipment also.

Maybe for piece of mind upgrade the wiring along with the Alternator?

 

Fuse seems to be 175Amp no matter which is fitted.

Edited 23 August, 20223 yr by varooom
Spellink

WD suggests it'll be 25mm² already on AMF/BNV/BNM so should be good to go on that front.

On my Polo it's only 16mm cable and a 90A alt, but watching a voltmeter it only starts to get pulled down if you have everything (both PTC relays, cabin fan, rear screen heater) on and leave it at idle revs, which I tend not to do for long enough to worry; just enough time to scrape ice from the side windows while the rear screen heater and PTC soften the other two. Once on the move the alt can cope, but the Polo is very dry compared to Fabia, so very little internal moisture to remove.

No ice and I'll drive straight off.

 

However, with the OEM system the control algorithm's probably going to get involved and reduce power to the PTC, so yes, probably best to put bigger alt there.

 

Edited 23 August, 20223 yr by Breezy_Pete

Cheers both. Yeah checked the fuse is 175 as mentioned, and the cabin fuse is 110 amp regardless of PTC/no PTC. Wire gauge is the same too. Will double check the alternator wire but I think it’s bigger of the too. At idle (no lights, no steering, no fans, just after startup) I have around 30% load in VCDS, so theoretically 60 amps spare which will be tight. Will make to sure to get some logs and see how bad it is.

 

Are those alternators on any other models @varooom? Trying to get this cheap as possible 

27 minutes ago, BilTechnik said:

Are those alternators on any other models @varooom? Trying to get this cheap as possible 

If you google with 045903023A as your search term you can see yes it does fit other models (all in theory) like Volkswagen Polo 2003-2006 9N 1.4 TDI Alternator 045903023A is equal to 6Q0199185D <-- Sorry grabbed information from a stupid website quickly, that number is bogus.

Getting a list of these "converted" numbers is never easy.

 

Start with the code that @Breezy_Pete gave you and hone your google-fu skills

Edited 23 August, 20223 yr by varooom
Wrong information from website

£20 later and I have a 120 amp alternator. Will start a new thread as a guide

Just now, BilTechnik said:

£20 later and I have a 120 amp alternator. Will start a new thread as a guide

Good luck 🤝

Thanks for assistance everyone