[Spridgets] How can you kill an alternator

[Chris]

I had that problem on my ’66 with the same set up and ended up with adding an extra diode as the current was “dirty” and there was some interesting feedback in the circuit.  Third alternator worked great after that mod.

Eventually I ended up changing over to a GM 10si  single wire for other reasons and did not have the same problem either.

Chris




On Feb 2, 2015, at 11:34 AM, Trevor Jessie via Spridgets <spridgets at autox.team.net> wrote:

> I'm just trying to rule out possibilities on how I'm killing so many alternators.  They fail slowly.  Gradually requiring more and more rpms before they start charging and eventually they quit charging regardless on rpms.  I'm on my fourth "rebuilt" Lucas unit from a major chain autoparts store.
> 
> On Mon, Feb 2, 2015 at 12:05 PM, Rick Fisk via Spridgets <spridgets at autox.team.net> wrote:
> Alternators have to turn about 3000 rpm before they start to really produce.  The typical automotive alternator turns three times faster than the engine.  If your engine is idling at 700 rpm it's below the point where the alternator makes current and your warning light comes on.
> 
> If your engine turns 6 grand the alternator is turning 18,000 rpm's!  So Trevor, I think the answer to your question is that the bearings will fail before the electronics.  The output of an alternator is a straight line once it gets up to speed and stays there throughout the rpm range.
> 
> Sent from my keyboard
> 
> > On Feb 2, 2015, at 11:39 AM, Larry Macy via Spridgets <spridgets at autox.team.net> wrote:
> >
> > So how come my waring light comes on when at low RPM’s and I have a GM alternator?
> >
> > Larry
> >
> >> On Feb 2, 2015, at 11:17 AM, tncarnut1 via Spridgets <spridgets at autox.team.net> wrote:
> >>
> >> If you're thinking that the output of an alternator varies with RPM, you are mistaken. That is the functional difference between an alternator and a generator. Generator output varies with RPM (why lights can go dimmer at idle on some cars), alternator does not. If I misunderstood your question, sorry.
> >>
> >> - David
> >>
> >>
> >> Sent via the Samsung GALAXY S® 5, an AT&T 4G LTE smartphone
> >>
> >>
> >> -------- Original message --------
> >> From: Trevor Jessie via Spridgets <spridgets at autox.team.net>
> >> Date:02/02/2015 5:41 AM (GMT-06:00)
> >> To: Spridgets <spridgets at autox.team.net>
> >> Cc:
> >> Subject: [Spridgets] How can you kill an alternator
> >>
> >> My real question is this :  assuming the bearings do not fail, how fast can you turn an alternator before it toasts something electronic?   Is there a huge margin, or are they engineered near their limited rpm?
> >>
> >> -Trevor
> >>
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