Topic

Hi guys, any body know the cables to a bosch alternator, I have taken out a marelli unit and have a bosch one to put back in but connections are marked differently ( B+1 and B+2 ON BOSCH and B+ , D+ and W on marelli).Please, some one give me a clue as there are bits of steam coming out of my ears

Problem solved with out resorting to violence, BUT WITH SOME REALLY TECHNICAL SWEARING , found the feed for dash warning light, what is the other terminal for in socket at top of alternator any clues please?

Do we talk about this one with p/n YLE101530 ? >> Magneti Marelli
http://www.rmlunits.com/Landrover_Rover__Car_Commercial__Alternator/100-050/
http://www.mgfcar.de/schedules/sb12.jpg
http://www.mgfcar.de/epc/1334.htm

Could be Battery+, Lamp ....from my little understanding. (edit ...)

Edit: just seen, the BOSCH Alternator (p/n) YLE102430 has a DFM Signal ... Not used at our MGs though.

I'm sorry for the mistake. BOSCH is the subject
OK the wire is for DFM. ( Digital Field Monitor terminal )
Not used wit our cars. At other cars it would feed to the ECU for further calculations on the alternator load.

HTH

Is this the Bosch you are fitting?

Yes, that is the beastie.I found warning light terminal,but the other terminal in socket at top of alternator was a mystery untill I was enlightend by Dieter.

It shows it as DFM on here

http://www.4start.eu/alternator-mg-tf-18-p-1823.html

What I would say is that it seems to be used on the MEMs3 systems, or at least it is wired in. I have read somewhere that the MEMs3 engine management will adjust idle revs to suit the load on the alternator, so maybe this is how it does it.

The spec sheet of a random regulator, but it does mention DFM.

http://www.datasheetcatalog.org/datasheet2/0/00jgxpdcxpzdgc4j2qphqea5e8wy.pdf

Looking into it a bit more it works with the ECU on some cars to provide a "Soft Start" to ensure that any load is gradually applied after start up.