alternator wiring.

[alloageorge]

battery light came on while driving along with some extra squealing on the fanbelt.
on inspection theres only one wire going into the alternator and another hanging loose.
i changed the belt and crimped a new connector onto the loose wire.
unfortunately battery light is staying on.
looking at another alternator are there supposed to be three wires?i cant find a third loose wire.
hope this makes sense.
also,are the plugs a standard size.where can i buy one?

[ake]

A scrap van is the best bet for a new plug

[alloageorge]

think ive sourced one from ebay for £4.50
hopefully that will work

still confused about 3rd wire though

[alloageorge]

attached the plug but no joy.i.ve noticed the battery light does not come on till i
start the engine.

[karl]

its not charging then if it comes on

their is 3 wires

i is signal 1 is ground and one is for the light on the dash

a think the green and white is signal from the ecu to

[alloageorge]

just as a follow up for anyone else out there who doesnt know what they
are doing most of the time.
I decided to take the new fanbelt off and forgot that the tensioner was at
full extension.as i moved the tensioner to loosen the flybelt i broke it.
Not only that but the tensioner was seized on and i had to pry off with
a small crowbar.
i've fitted a new alternator(which was surprisingly easy).
Just need to source a new tensioner

[alloageorge]

in case any other novice mechanics read this.
van working well now.was a bit tight putting on fan belt
and i didn't tighten the tensioner bolt enough.fortunately
it was obvious when i started the engine.