[C320-list] Alternator to batteries

[John Meyers]

I am no electrician so I don't know if this will work. I assume that there
are wires from the alternator directly to the battery(?) If so can the
positive wire (maybe the negative wire too) be CAREFULLY disconnected from
the battery after the engine is running and have a volt meter test the
output on those disconnected wire?

John Meyers

On Sat, Mar 25, 2017 at 11:53 AM, Ted Harrison <
tharrison at innovations-plus.com> wrote:

> I will get back to you on this one. Will go to the boat (on the hard) next
> weekend
>
> Thanks for your help.
>
> Ted Harrison
>
> > On Mar 25, 2017, at 11:42 AM, Graeme Clark <cg at skyflyer.co.uk> wrote:
> >
> > How are the terminals on the back of the alternator marked
> > Possible alternatives might be F, B+, B-, GND, and so on.
> >
> > Generally B+ is the one that connects to the battery and F will be the
> purple wire to the field excitation.
> >
> > You can test voltage at end of purple wire, without connecting
> altimeter- just put a voltmeter (or even a 12v bulb) between it and a
> suitable earth/ground point
> >
> > Graeme
> >
> >> On 25 Mar 2017, at 14:34, Ted Harrison <tharrison at innovations-plus.com>
> wrote:
> >>
> >> Yes I removed the alternator and had it bench tested.
> >>
> >> How to you test the voltage from the switch to the alternator? Where on
> the alternator do you place the volt meters leads?
> >>
> >> Thanks
> >>
> >> Ted Harrison
> >>
> >>> On Mar 25, 2017, at 10:19 AM, Graeme Clark <cg at skyflyer.co.uk> wrote:
> >>>
> >>> Ted
> >>>
> >>> Not sure if this helps but when you turn on the ignition key-switch,
> power is connected to the alternator field coils, which on my boat is a
> thick purple wire (10 gauge?).
> >>> Without energising the field coils the alternator will not output
> anything.
> >>> In fact - on my own set up -  the PO fitted a ‘smart-charger’ that
> feeds the field coils so my purple wire has been disconnected.
> >>> When you say your alternator was tested, do you mean whilst being
> turned by the engine, or when removed. If it was bench tested then the next
> step is to make sure that when the ignition is on, the filed coils are
> getting a voltage, and then when it is running, (mind fingers in belts) the
> alternator is producing a charge voltage.
> >>> If it is then the problem lies between the alternator and the
> batteries and at least you have helped isolate the issue.
> >>> Hope this helps
> >>>
> >>> Graeme
> >>> #366, 1996
> >>>> On 25 Mar 2017, at 14:12, Ted Harrison <tharrison at innovations-plus.
> com> wrote:
> >>>>
> >>>> Just had the alternator tested and it is ok. Is there a fuse
> somewhere that would prevent the alternator from charging the batteries?
> >>>>
> >>>> 1997 hull 424
> >>>> Whitby
> >>>>
> >>>> Ted Harrison
> >>>
> >>> ———————————————————
> >>> I work irregular hours and often write emails late in the evening and
> at weekends; that doesn’t mean I expect you to do the same; reply when
> convenient!
> >
> > ———————————————————
> > I work irregular hours and often write emails late in the evening and at
> weekends; that doesn’t mean I expect you to do the same; reply when
> convenient!
> >
> >
> >
> >
> >
>