Ptroblem started while rewiring a new panel and engine would not start due t
o a different problem. When looking to replace diode I got confused with dif
fering advice and written instructions, but was sure it should be as diagra
m.
All good now ready for continental adventures again??
Regards
Dave Park
> On 7 Jun 2021, at 12:29, Alan Burrill <alanb@dpy01.co.uk> wrote:
>
> =EF=BBKingsley, no problem here and I was just ensuring with the diagra
m that everyone contributing had access to the same info.
>
> I think Dave has indicated he has the answer - he might even share what wa
s causing the problem. =F0=9F=98
>
> Alan
>
>> On 7 Jun 2021, at 12:02, Kingsley Hurst <kingsnjan@westnet.com.au> wrote:
>>
>> =EF=BBHello Alan,
>>
>> I wasn=99t intending to infer the diode should be across the starte
r motor as I clearly said starter solenoid in my opening paragraph.
>>
>> Without digging a deeper hole for myself, I offer no excuses for the erro
rs in my posting other than to say my brain was obviously not engaged proper
ly after 8 hrs of driving today.
>>
>> Please accept my apology (and you too Dave) for my misdemeanour.
>>
>> Regards
>> Kingsley.
>>
>> Sent from my iPhone
>>
>>>> On 7 Jun 2021, at 8:19 pm, Alan Burrill <alanb@dpy01.co.uk> wrote:
>>>>
>>> =EF=BB
>>> <image0.jpeg>
>>>
>>> The diode is connected across the starter solenoid coil not the contacts
for the starter motor as per the extract from the build manual above. There
is no diode across the starter motor shown in the build manual diagram, at l
east not my version.
>>>
>>> With 12v positive on the starter contacter coil the diode, with the cath
ode or marked end of the diode connected to positive terminal of the starter
coil, is reverse biased and so will not conduct. When the starter button re
lease the falling emf, magnetic field, produces an opposite voltage in the c
oil and can spark across the starter switch contacts eventually damaging the
contacts, 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 n
ot work, assuming the solenoid will operate without diode connected as a tes
t 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> wro
te:
>>>>>
>>>> =EF=BBHello Dave,
>>>>
>>>> I haven=99t got your previous posts in front of me but I assume y
ou want to put the diode across the starter solenoid.
>>>>
>>>> If my assumption is correct, you should connect the anode to the starte
r motor side of the starter solenoid and the cathode to the positive (starte
r switch) side of the solenoid.
>>>>
>>>> If you have had it connected the other way around and tried starting th
e engine, the diode would have been forward biased trying to carry the full c
urrent 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
conducts 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
through the solenoid. On releasing the starter button (or key switch), the
collapsing magnetic field in the starter solenoid tries to induce a high vo
ltage spike but this is swamped by the diode because the diode short circuit
s the current induced by the collapsing magnetic field in the coil.
>>>>
>>>> Hope this hasn=99t made it more confusing for you. I could and p
robably 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
resistance 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?
Not 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
grace is the start solenoid is looking for 12 volts. Of course, the soleno
id must be grounded.
>>>>>>>> Most mistakes are the ground is left off the solenoid when putting o
n 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 accept
ed practice to extend the life of the contacts in the starter solenoid. The
Europa 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 starte
r switch tab and the cathode or negative goes to the ground bolt holding on t
he starter solenoid. I use at least a #18 or 16 wire from the solenoid fast
ening bolt to the main firewall ground.
>>>>>>>>
>>>>>>>>
>>>>>>>> Best Regards,
>>>>>>>> Bud Yerly
>>>>>>>>
>>>>>>>> -----Original Message-----
>>>>>>>> From: owner-europa-list-server@matronics.com <owner-europa-list-ser
ver@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 wa
s as described with band end cathode on starter terminal and other end to ea
rth?
>>>>>>>> Have I got wrong diode.
>>>>>>>> Any advice appreciated
>>>>>>>>
>>>>>>>> Dave Park G-LDVO
>>>>>>>>
>>>>>>>>
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