Magnet Marelli Alternator.

calypso · Post by **calypso** » Fri Sep 30, 2011 8:12 am

Help required here ,from an auto electrician who is familiar with the Magnet Marelli A127-65 alternator. The old alternator (12 v.make unknown) finally threw in the towel .....lugs broken ,insides smoked etc. Ive managed to find a brand new Marelli A127-65 alternator but it requires a different mode of wiring .(the previous one used a multi plug connection + main wire) The marelli uses stud fittings and the numerals on the connection points are different .Since the original wiring is almost fossilized ,im going to rewire everything . Problem is, im no auto electrician ....i just understand basic stuff . Could somebody provide me with a sketch of which wires go where for the new unit . The terminals on the unit are designated W...B+....D+ Any help will be much appreciated.

Post by **wesk** » Fri Sep 30, 2011 11:41 am

How many wires were attached to the old alternator and what were the tab or stud codes for those wire attaching points?

Post by **wesk** » Fri Sep 30, 2011 12:00 pm

This site will help:
http://www.carkb.com/Uwe/Forum.aspx/lan ... or-fitting

W is the 110 output for a rev counter.
B+ gets the ignition or idiot lite wire.
D+ is main output to battery or starter terminal.

calypso · Post by **calypso** » Sat Oct 01, 2011 6:31 am

ok thanks for the reply . Wes are you sure about the B+ D+ terminals .The B+ looks a lot heavier than the D+ ........if its carrying the main battery supply??

Post by **wesk** » Sat Oct 01, 2011 11:58 pm

No, I was quoting what the fellow on that link said.

calypso · Post by **calypso** » Sun Oct 02, 2011 8:25 am

The original alternator had the letter designations F. N . E . for the 3 multi plug terminals and the letter B for the lone terminal with the thick lead.

Post by **wesk** » Sun Oct 02, 2011 9:32 am

With those letters the use for each is usually:

B = battery Main power feed.
E = earth / ground or could be energize for the switch connection
F = field
N = Not sure but would believe it is for the idiot lite or it could be negative for ground..

Try googling the manufacturer for each alternator and see their terminal chart for that specific model alternator.

Or call a local auto-electric shop and they will have a publicatiuon that shows all the terminal arrangements for most alternators.