Nose Cone Wiring

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Derek Clews

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Aug 3, 2019, 6:13:22 PM8/3/19
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Dear All,

In the Q manual the nose cone wiring has two diodes. The values required are not mentioned. What was the Quantum spec?

I appreciate it is in a 12V system so 15 or 16 volt would cover, but does anyone know the minimum wattage?

Thanks

Derek

kynastonp .

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Aug 3, 2019, 6:24:53 PM8/3/19
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The diodes supplied were 1N4005 , 5 amp diodes . all they are doing is driving the coil of a relay when either the sidelights or the headlamp main beam flash is used  so 5 amp should be more than adequate. I used a bridge rectifier on mine as it is easy to mount and comes with Lucas spade connectors , needs a bit of care to get the right diodes ~~ to sidelight/headlamp and- to relay coil .

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Julian Coleman

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Aug 4, 2019, 1:34:43 AM8/4/19
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Hi

I don't know that circuit is doing or what loads there are on it,  but I'd opt for something of a considerably higher reverse rating than 15V. When a coil is switched off it will create a considerable voltage spike when the energy is removed. What that voltage is will depend on the coil and the way the energy is cut - the more abrupt (eg a switch/relay), the higher the voltage. Since diodes are available in versions with inverse ratings of 100s of volts, this is neither difficult nor expensive.

Julian Coleman
City Audio Services



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Re: [Quantum Owners] Nose Cone Wiring

Bill Allison

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Aug 4, 2019, 2:27:05 AM8/4/19
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The diodes mentioned earlier, 1N4005, have a reverse voltage rating of 600v which is more than adequate.

Best regards
Bill Allison

chris...@btinternet.com

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Aug 4, 2019, 8:04:14 AM8/4/19
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Eek, I didn't know there were different sizes......

When I rewired mine I got these from car builders solutions.

https://www.carbuildersolutions.com/uk/silicon-diode

They seem to work and they were the only diodes they sell.

Chris G

Julian Coleman

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Aug 4, 2019, 9:35:52 AM8/4/19
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10A is certainly enough current handling capacity for a couple of indicators and it may well be that the diodes are not subjected to significant back emf.  

If it's working, they're probably fine. But if it fails, consider getting a diode with a higher reverse voltage rating. Of course getting one that is encapsulated is not going to be easy, but there are easy ways to solve that problem. 

Meanwhile, don't worry.

Julian Coleman
City Audio Services



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Re: [Quantum Owners] Nose Cone Wiring

kynastonp .

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Aug 4, 2019, 10:03:54 AM8/4/19
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If you want a neat package and 1000 volts peak reverse volts try digi-key part number gbpc3510-nd  even has a hole for a mounting bolt. All the diodes do is drive the relay to position the headlamp cover motors so only the coil current of the relay is passed through the diode.

From: quantu...@googlegroups.com <quantu...@googlegroups.com> on behalf of Julian Coleman <jul...@cityaudioservices.com>
Sent: Sunday, August 4, 2019 2:35:49 PM
To: quantu...@googlegroups.com <quantu...@googlegroups.com>

Derek Clews

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Aug 4, 2019, 5:19:04 PM8/4/19
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Thanks All,

Looks like I can get some of the recommended ones from e(vil)bay.  

Cheers

Derek


Derek Clews

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Aug 6, 2019, 3:52:34 AM8/6/19
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HI All,

Checking through my wiring again and found the wiring fault is a transposition of wiring terminals in the relay socket.  The original one was a type A and it seems everything for sale aftermarket now is a type B.  The pins 30 & 86 are reversed.  They are the constant 12V and Earth on the diagram!

Continuity checking the wiring and it all seems OK otherwise.  The motor still runs correctly when isolated and powered by external battery, just not given the right signal due to the relay/wiring configuration.  

Found a website that explained it.  


Did not even know it was a possible to have a difference.  So pass it on to stop us being caught out.

Was type A a flasher relay perhaps?

ATB

Derek



On 4 Aug 2019, at 15:03, kynastonp . <kyna...@gmail.com> wrote:

If you want a neat package and 1000 volts peak reverse volts try digi-key part number gbpc3510-nd  even has a hole for a mounting bolt. All the diodes do is drive the relay to position the headlamp cover motors so only the coil current of the relay is passed through the diode.

From: quantu...@googlegroups.com <quantu...@googlegroups.com> on behalf of Julian Coleman <jul...@cityaudioservices.com>
Sent: Sunday, August 4, 2019 2:35:49 PM
To: quantu...@googlegroups.com <quantu...@googlegroups.com>
Subject: Re: [Quantum Owners] Nose Cone Wiring
 ,

Jim Hearne

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Aug 6, 2019, 4:40:16 AM8/6/19
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There have always been 2 different standards for “Normal” relays on cars A type and B type.
I expect it was the usual UK V others like wiring colours.
 
Jim

Derek Clews

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Aug 6, 2019, 5:05:40 AM8/6/19
to Quantum Owners Forum, Derek Clews
Thanks Jim,

Interesting that I found it difficult to find a Type A 30/40A for sale on the web.  

I found I could remove the contacts for the block so have changed to type B now.  Still it has saved me a wiring job, I was planning to start from scratch with new as I had not done the original wiring on the coupe and did not know how good it was under the wrap.  

Derek





Mark Alford

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Aug 9, 2019, 5:24:15 PM8/9/19
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Which car model are you referring to 2+2 or?
When you mention nose cone i think of Xtreme - I dont remember diodes in my Xtreme...
cheers
Mark

chris...@btinternet.com

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Aug 10, 2019, 6:05:58 AM8/10/19
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Diodes are for working the headlight flaps in the 2+2 and saloon, so that
the flaps open when you flash the lights.

You don't need them if you only want the spot lights to flash (the
headlights will still flash but the flaps won't open).

Flaps will be open when lights are on full beam as they are powered from
side lights.

I think 2+2 has a slightly different set up as side lights are next to
indicators. Jim has done a wiring diagram somewhere.

Chris G

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From: 'Mark Alford' via Quantum Owners Group
Sent: Friday, August 9, 2019 7:00 PM
To: Quantum Owners Group
Subject: Re: [Quantum Owners] Nose Cone Wiring

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Owners Club nor the individuals associated with the Quantum Owners Club or
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within this or related message(s).
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