How to excite A 4 Wire Alternator
How to Excite the One Wire - Self Exciting Alternator.
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alternate your man here I want to talk
to you about exciting self exciting
alternators now that may sound funny to
you if you know anything about it
because self exciting alternators mean
that they start themselves up in other
words all you have to do is hook up your
battery we're either here here or here
and that's all there's no ignition wire
to the alternator all to activate it and
it just when it starts spinning it it's
excites itself I don't know how that
does that this is the innards of a
tennis I out here all bolted together
you have your stator and you have your
rotor and both your stator and rotor our
electromagnets the rotor gets us power
through the brushes and the brush holder
and the stator gets us power through the
battery post on the back of the
alternator it has diodes in it diodes
are one-way gates they let power flow
out but nothing flow back in but they do
let a very very minut amount of power
back into the stator keeping its
magnetism really low but somewhat there
the rotor basically has no magnetism to
the brushes fire at other than residual
magnetism basically self exciting units
work off the residual magnetism
left over in the stator and the rotor
the rotor once this gets powered to it
if you've ever made an electromagnet out
of a battery and a nail once you send
power through that battery through the
wire to the nail when you're done with
the battery you shut it off that nail
still has a little bit of magnetism left
over and that's how our these are and
what it does and they all the voltage
self exciting voltage regulator would be
right here and typically you'd have an
ignition wire to activate it but on self
exciting you don't have anything there
and so what is when the rotor spins
inside the stator a little signal goes
up through the stator through the diode
tree on the 10s I Series up it gets to
the voltage regulator the voltage
regulator sees that my new pulse of
power and it knows them to turn itself
on so the regulator turns itself on and
a way the whole system goes and the
reason I'm talking about is I got a call
from a guy who has a he got a CS 144 all
Kaneda self exciting and it's at around
for about a year on the shelf and he
stuck it on a vehicle and tried it and
it didn't work and he called us says
what's going on so what it is and the
reason it didn't work is because this
maintains its magnetism because power is
connected to the battery post and that
little bit of leakage through into the
stator kind of keeps the stator alive
and the rotor is gonna have a little bit
but when it sits on the shelf it's not
connect to the battery it hasn't been
used it ends up losing all of that
magnetism to the point where you hook it
up and it starts spinning it won't do
anything so therefore you have to excite
them well there's a lot of manufacturers
that are involved in self exciting
you've got your GM all there's a CS
series a cs-137 44 the cs 130 D this is
the si series Denzil has one Ford has
one but they all excite and do the same
same exact thing so what you have to do
if if your self exciting alternator has
been sitting around or just isn't
working you have to excite them so this
is how you excite them on the earlier si
series it has this black plastic plug on
it you pry that plug off and what you'd
want to do is run a jumper from your
main battery with it with the alternator
hooked up and running run a main jumper
from your battery post cheer are our
number one terminal and just momentarily
touch it on there until it gets going
and once it gets going and makes
magnetism then it's going to be good for
quite a while it's going to hold on to
that residual magnetism with all the GMC
s series this is CS 130 that covers the
130 D which is a four pin but it's
rounded end it's got things this plug in
right here you have little mini letters
it says SF LP on these little letters
what the P is the P is a pulse for a
tachometer some GM vehicles and other
manufacturer vehicles can run their
tachometer from a pulse on the
alternator and that's actually coming
from the stator lead inside the
alternator they're actually getting that
pulse from one of these stator leads so
you have to be kind of careful on these
because this is AC current so well this
out they're hooked up and running what
you'd want to do
is take a jump or a small jumper wire
and go in there and just touch that P
terminal which is going to send 12 volt
power directly into the stator well once
that thing gets going you have to be
careful because AC power will come out
of that stator so you want to use a
fully insulated probe to get in there
and just touch it on that and see if
that does the job that will power up the
stator and get it all magnetized for you
and once they get going as they say once
they get going they should hold their
magnetism for quite a long time now we
end up with the 10 aside a lot of people
put these on tractors and things like
that where they won't excite you may
have to end up these the SI series will
still work off of an ignition where the
SI s series won't all the CL series they
kick on right away if you start a CS
series it's gonna power up and give you
power immediately sometimes the SI
series you have to rev them and
sometimes they'll turn so slow on the
motor that they won't activate and in
that case you're gonna have to either
set up a key switch and touch it here or
you can do a push-button you can put a
push button on your dash or wherever and
if your alternate does not want to kick
on your self exciter you can just pulse
it we're a regular alternator has to
have an ignition wire to it at all times
and so if you just pulsed if you just
touch that with a self exciting it will
take off you'll spark a little bit but
it'll take off it'll go it'll stay if
it's a non self exciting out there when
you touch on or take it off it will quit
it'll it'll run with it on but then when
it's off it'll quit that's a non self
exciting type regular that's one way to
tell when you get into the six volt
alternators a lot of people who are
converting generators to 6 volt all
tears now when you the negative ground 6
volts are gonna excite the same way from
the battery post to the number 1
terminal but with the 6 volt positive
ground everything is reversed but the
voltage regulators in the positive
ground are still negative ground to
excite a positive ground
10s I type alternator you have to run
from the case to the number 1 terminal
because the positive ground negative
goes to the battery post right here at
positive actually goes to the case but
the regulator's are still set up for
negative ground so this with a negative
ground negative ground set up you have
to put positive power to the number one
terminal so the positive ground set up
you have to run from the case to the
number one terminal if you're still
doing positive ground to that terminal
and that is why in some cases you would
have to excite a self exciting alternate
it sounds kind of weird a lot of people
don't think why would I have to excite a
self exciting out there but as I said
they can lose their residual magnetism
from sitting around whatever all kinds
of things can take out the magnets of
anil you'll get them started and they
just won't work but once you get them
started they should go all the time
