The Rotax starter arrangement is not the same as a car starter. Instead
of engaging gears the gears are already engaged and the drive is through
a sprag clutch. If the starter does not receive enough current it will
not provide enough speed to throw the clutch into engagement. To find
out whether the problem is downstream of the starter solenoid you could
temporarily bypass the solenoid and use the battery master as a
temporary starter switch. This needs to be done with care. Make sure the
ignition is OFF!!
Nigel Charles
> -----Original Message-----
> From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-
> server@matronics.com] On Behalf Of Fred Fillinger
> Sent: 30 October 2005 13:57
> To: europa-list@matronics.com
> Subject: Re: Europa-List: fat wires
>
>
> > I have made up my fat wires (2awg) with soldered
> terminals. I have
> > checked the resistance of all these and the highest
> reading I get is 0.6
> > ohm on a 2.5m cable. I am not sure how much this means
> because my
> > multimeter is not very accurate at this level.
> >
> > Paul Atkinson
>
> A multimeter cannot read super low resistances, and .6 Ohm
> will exhibit the symptom you have but not necessarily the
> cause. The simplest diagnostic is automotive jumper cables
> to bypass your cables. They can even be #6-8 like they sell
> us for cheap, and tell us something.
>
> I would not solder a #2, even tho I have exhausted several
> miles of solder wire over the years by now. If above says
> cable, then its your connector(s).
>
> It's possible too much chattering on the contactor has
> degraded it, or defective. On the AeroElectric connection,
> there is a clever (of course!) milliOhm tester using a
> D-cell battery, wires, clips, and a voltmeter. Problem is
> with a digital multimeter, the D-cell is discharging quickly
> (you have a dead short on it), and the numbers are flipping
> so work quick. An analog meter is better, but it may not
> have a 1 Volt scale setting. 10V forget it.
>
> But such test can diagnose cable and contactor. For latter,
> a separate battery closes relay; measure with the D-cell. I
> can't remember a typical spec sheet; maybe 2 milliOhms. It
> possible that little supplied contactor is too "Ohmy" for
> the 912S problem.
>
> The tester can do the starter too for an approximate test,
> killing another D-cell, better if it will spin the motor a
> little w/o engaging gear. Or remove starter and turn gear
> so we're not measuring one brush position only. Maybe one
> Ohm? Never tried it.
>
> Good luck!
>
> Reg,
> Fred F.
>
>
>
>
>
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