There is a design flaw also in the alternator if this is the case. (not
surprising at all) The alternator shouldn't run "flat out" if unloaded.
The regulator should "see" the output of the B+ terminal at over 14V and
keep the exciter off. If this was the case and there was anything over
about 40 volts at the B+ terminal, the same voltage would be present at the
little tab via the 3 freewheeling diodes, and this would flow back through
the alternator light and blow the bulb.
Recently I came upon a scenario where someone was doing just this thing to
older AC Delco alternators. (similar internal circuit) Someone was driving
4 of these alternators with a small gasoline engine and using them to power
a large 48v DC PM motor to spin up a flywheel. (yes, strange!) Once the
flywheel was up to a certain RPM a centrifugal switch stolen from an AC
motor would open and leave all 4 alternators open-circuit. They had mounted
the alternators to a wooden frame to electrically isolate the grounds and
had them wired in series. The Gas engine was a 6hp unit originally from a
3500 Watt Honda AC generator and had a mechanical governor to keep it
running at a constant 3600 RPM., and the pulley on the crank side was about
the same size as most car engine main pulleys, so I would imagine the
alternators were spinning at least 8000 RPM. When the motor first was
switched on it almost killed the engine, and probably would have if the belt
wasn't slipping so much.
I didn't have an ammeter handy, but if it really is loading that 6hp engine
all the way, that would be almost 4500 watts. If they are 1000 watt
alternators (typical) that puts them close to rated output producing almost
80 amps each.
The guy running this strange thing has been doing so for about a year on and
off now. He has the same 4 alternators.
-Phil
----- Original Message -----
From: "Bob Bruce" <bobbruce@mts.net>
To: "John" <john@npagroup.com>; "Peugeot List" <peugeot-L@yahoogroups.com>
Sent: Wednesday, April 06, 2005 9:38 AM
Subject: Re: [Peugeot-L] Alternator fix question 405 TD
>
> there is a joint at the starter solenoid where
> the B+ wire from the alt is crimped to the pos battery cable
> this joint fails
> the more humid and salty the conditions the sooer this will happen
> It may never happen in the desert but when the connection developes some
> resistance
> it will cause the alt to charge flat out and self destruct
> all the rectifiers will burn out
> I have found it necessary to run a 10 ga wire direct from alt B+ terminal
> directly to the pos post of the battery
> Leave the existing wiring in place
> This will save you the trouble of replacing your new alternator a few days
> after
> you replace the old one
On
> And correct another serious design flaw of the 405...
> I am assuming that the diesel is wired the same as the gas 405s sold in
> Canada and the USA
> ----- Original Message -----
> From: John
> To: peugeot-L@yahoogroups.com
> Sent: Wednesday, April 06, 2005 4:32 AM
> Subject: [Peugeot-L] Alternator fix question 405 TD
>
>
>
> Hi all, I have a broken alternator, no charge to battery, light on, and
> tried other batteries so 100% its Alt. I have a spare one, but the
> armature doesn't turn, it looks like the pulley is too close to body.
>
> I am wondering if I can pull any bits from this and put in faulty one?
> I.e. brushes..? (I remeber someone posting about this last week so will
> have a look thru archives)
>
> all the best
> John
>
>
>
>
>
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Received on Wed Apr 6 10:42:47 2005
