Thanks everyone, happy now=F0=9F=98=84=F0=9F=98=84=F0=9F=98=84
Dave Park
> On 7 Jun 2021, at 11:00, Alan Burrill <alanb@dpy01.co.uk> wrote:
>
> =EF=BB
>
> The diode is connected across the starter solenoid coil not the contacts f
or the starter motor as per the extract from the build manual above. There i
s no diode across the starter motor shown in the build manual diagram, at le
ast not my version.
>
> With 12v positive on the starter contacter coil the diode, with the cathod
e or marked end of the diode connected to positive terminal of the starter c
oil, is reverse biased and so will not conduct. When the starter button rele
ase the falling emf, magnetic field, produces an opposite voltage in the coi
l and can spark across the starter switch contacts eventually damaging the c
ontacts, the diode shorts out this so the spark does not happen.
>
> If the diode is shorted out, or the wrong way round, then solenoid will no
t work, assuming the solenoid will operate without diode connected as a test
to ensure it=99s the wiring of the diode that=99s the problem o
f course.
>
> Isn=99t explaining electrical problems by email fun
.=F0=9F=A4=A9
>
> Alan
>
>
> Sent from my iPad
>
>>> On 7 Jun 2021, at 10:44, Kingsley Hurst <kingsnjan@westnet.com.au> wrote
:
>>>
>> =EF=BBHello Dave,
>>
>> I haven=99t got your previous posts in front of me but I assume you
want to put the diode across the starter solenoid.
>>
>> If my assumption is correct, you should connect the anode to the starter m
otor side of the starter solenoid and the cathode to the positive (starter s
witch) side of the solenoid.
>>
>> If you have had it connected the other way around and tried starting the e
ngine, the diode would have been forward biased trying to carry the full cur
rent of the starter motor and more than likely will be ruined.
>>
>> Either check the diode with a multi meter ( on ohms scale) to ensure it c
onducts in one direction but not the other or use a new diode.
>>
>> When connected correctly, on pressing the starter button (or key switch),
the diode is reverse biased and has no effect..... all the current passes t
hrough the solenoid. On releasing the starter button (or key switch), the c
ollapsing magnetic field in the starter solenoid tries to induce a high volt
age spike but this is swamped by the diode because the diode short circuits t
he current induced by the collapsing magnetic field in the coil.
>>
>> Hope this hasn=99t made it more confusing for you. I could and pro
bably should have just said ..... connect it like the manual says.
>>
>> Best regards
>> Kingsley in Oz.
>>
>> Sent from my iPhone
>>
>>>> On 7 Jun 2021, at 7:17 pm, david park <dpark748@me.com> wrote:
>>>>
>>> =EF=BBAllan have you put ANODE to switch contact?
>>>
>>> Dave Park
>>>
>>>
>>>>> On 7 Jun 2021, at 09:35, Alan Burrill <alanb@dpy01.co.uk> wrote:
>>>>>
>>>> =EF=BBAre you sure the diode is not faulty?
>>>>
>>>> You can check it with an meter set to read resistance. Should be high r
esistance one way and low the other.
>>>>
>>>> Have you tried connecting it the other way round?
>>>>
>>>> Alan
>>>>
>>>> Sent from my iPad
>>>>
>>>>>> On 7 Jun 2021, at 09:02, david park <dpark748@me.com> wrote:
>>>>>>
>>>>> =EF=BBBud,
>>>>> Still confused as Europa Manual wiring diagram shows Anode to Earth? N
ot switch.
>>>>> Regards
>>>>> Dave Park
>>>>>
>>>>>
>>>>>>> On 7 Jun 2021, at 01:06, Bud Yerly <budyerly@msn.com> wrote:
>>>>>>>
>>>>>> =EF=BB
>>>>>> Dave,
>>>>>> I didn't see anyone commented on your diode.
>>>>>>
>>>>>> Pretty much any diode will do. If you get it backwards, the saving g
race is the start solenoid is looking for 12 volts. Of course, the solenoid
must be grounded.
>>>>>> Most mistakes are the ground is left off the solenoid when putting on
the diode. Another problem is guys don=99t insulate the anode side o
f the diode and it shorts.
>>>>>>
>>>>>> The Rotax manual doesn't comment on the diode. But it is an accepted
practice to extend the life of the contacts in the starter solenoid. The E
uropa Electrical Chapter 25 advises to use an IN5404 but any will do.
>>>>>>
>>>>>> IN5404
>>>>>> <image001.png>
>>>>>>
>>>>>> silicone diode is shown above. Anode or plus side is on the starter s
witch tab and the cathode or negative goes to the ground bolt holding on the
starter solenoid. I use at least a #18 or 16 wire from the solenoid fasten
ing bolt to the main firewall ground.
>>>>>>
>>>>>> Best Regards,
>>>>>> Bud Yerly
>>>>>>
>>>>>> -----Original Message-----
>>>>>> From: owner-europa-list-server@matronics.com <owner-europa-list-serve
r@matronics.com> On Behalf Of david park
>>>>>> Sent: Wednesday, June 02, 2021 2:44 PM
>>>>>> To: europa-list@matronics.com
>>>>>> Subject: Europa-List: Starter Diode
>>>>>>
>>>>>>
>>>>>> I fitted a starter Diode and engine would not start. Orientation was a
s described with band end cathode on starter terminal and other end to earth
?
>>>>>> Have I got wrong diode.
>>>>>> Any advice appreciated
>>>>>>
>>>>>> Dave Park G-LDVO
>>>>>>
>>>>>>
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