Hi Mike,

Well sad news.  Finally mounted the alternator on my super little cast
aluminium bracket.    It looks so professional sitting in there, snugged
up beside the engine.  Even milled a slot into a piece of stainless
strap to adjust belt tension.  I get 12.9VAC open circuit at full power
in gear.  I'll measure current into the battery later but it looks like
I'm going to have to make up a pattern and cast a gearbox casing/bracket
assembly.  All it costs is a bit of time,  13 minutes of propane at
250,000 BTU and time to let the casting cool.  Then the gears, bearings
etc.

Looking more and more like I should pull the engine and find out what
went wrong with the alternator buried behind the flywheel.

Sigh....

John


Wireless CAN with the CANRF module.
http://www.autoartisans.com/documents/canrf_prod_announcement.pdf
Automation Artisans Inc.
Ph. 1 250 544 4950


> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Mike Singer
> Sent: Monday, July 15, 2002 2:39 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE] Alternator Regulators.
>
>
> John,
> test the alternator at that RPM, it is intended for.
> If you have 6v 3000 RPM motorcycle alternator
> then it is OK.
>  Find 12v alternator of low RPM engines or change
> if possible transmission ratio from engine to the
> alternator to increase RPMs.
>
>    Cheer up. Mike.
>
> John Dammeyer wrote:
> > The manual states the procedure on how to test the output of the
> > alternator and that's what I did.  At maximum engine RPM the
> > alternator
> > produced about 3VAC.
> >
> > It's possible that at some point I may have inadvertently
> shut off the
> > Master Battery switch while the engine was still running.
> This would
> > have disconnected the battery from the alternator output
> and blown the
> > regulator which in turn took out the windings.   It's a
> common problem
> > on boats with master switches and Diesels that don't care
> if they have
> > electricity for operation.  This "Load Dump" can be prevented
> > by putting
> > a hefty transorb on the output of the alternator regulator
> to keep the
> > voltage within some safe point.  Given that this diesel is
> > from the mid
> > 70's the chance of it surviving a Load Dump is pretty
> > unlikely.  So more
> > than likely I shot myself in the foot.
> >
> > That's one reason why I would like to have a system that has high
> > voltage diodes and regulator transistors to be capable of
> > with standing
> > the Load Dump voltages.
> >
> > Sigh....
>
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