Convert dynamo from positive to negative earth ..

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Convert dynamo from positive to negative earth ..

Postby Taid » Sat Nov 09, 2019 12:46 pm

This topic has been touched on over the years, but nothing, as far as I can find, specific.

Modern bits of electronickery I am contemplating fitting tend to want 'Negative earth' wiring and as far as I read it is a (comparatively) simple job to convert the dynamo by 'flashing' the field coil.

I would appreciate a simple step by step list of instructions to do the job.

Thanks
Nostalgia taking over ..

Currently ..1957 AJS 16MS .. Restored/registered 1987

Previously ..
1951 Sun Villiers 125 (1951-53)
1955 AJS 16MS (1955-56)
1952 Vincent Comet (1958 - 84 .. Not ridden after 62)

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Re: Convert dynamo from positive to negative earth ..

Postby SPRIDDLER » Sat Nov 09, 2019 1:58 pm

I poke badgers with spoons.

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Re: Convert dynamo from positive to negative earth ..

Postby Taid » Sat Nov 09, 2019 2:24 pm




Ah, thank you S .. as I have often said, There's no substitute for knowing what you are doing ..
Nostalgia taking over ..

Currently ..1957 AJS 16MS .. Restored/registered 1987

Previously ..
1951 Sun Villiers 125 (1951-53)
1955 AJS 16MS (1955-56)
1952 Vincent Comet (1958 - 84 .. Not ridden after 62)

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Location: DEVON UK

Re: Convert dynamo from positive to negative earth ..

Postby MalcW » Mon Nov 11, 2019 10:49 am

I used the MatchlessCluess instructions to do mine. It's very straightforward, in fact it takes a lot longer to read about than to do.

Malc

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Re: Convert dynamo from positive to negative earth ..

Postby Taid » Mon Nov 11, 2019 11:24 am

MalcW wrote:I used the MatchlessCluess instructions to do mine. It's very straightforward, in fact it takes a lot longer to read about than to do.

Malc


I should have done more research before I started .. Only planned to go 12v so bought a DVR2 Positive earth regulator, fixed inside old regulator case .. now Ive got to get the Negative earth version and hope someone will give me a fair price on the other one .. :headbang:
Nostalgia taking over ..

Currently ..1957 AJS 16MS .. Restored/registered 1987

Previously ..
1951 Sun Villiers 125 (1951-53)
1955 AJS 16MS (1955-56)
1952 Vincent Comet (1958 - 84 .. Not ridden after 62)

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Joined: Wed Sep 01, 2004 12:00 am
Location: WEST SUSSEX UK

Re: Convert dynamo from positive to negative earth ..

Postby SPRIDDLER » Mon Nov 11, 2019 12:08 pm

Why do you want to change to Neg earth?
You said it's because you plan to fit modern electrickery (LED headlamp and flasher units?). If so, they are available in 6 or 12v and Pos or Neg earth.

http://www.norbsa02.freeuk.com/
I poke badgers with spoons.

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Location: Shropshire UK

Re: Convert dynamo from positive to negative earth ..

Postby Taid » Mon Nov 11, 2019 12:32 pm

SPRIDDLER wrote:Why do you want to change to Neg earth?
You said it's because you plan to fit modern electrickery (LED headlamp and flasher units?). If so, they are available in 6 or 12v and Pos or Neg earth.

http://www.norbsa02.freeuk.com/


really, it's electronickery ..

I've got the Smart Turn and Smart Brake System stuff which is negative earth .. I'm just awaiting a response from them as to whether it can be used positive earth, though looking at the kits and installation instructions, I doubt it
Nostalgia taking over ..

Currently ..1957 AJS 16MS .. Restored/registered 1987

Previously ..
1951 Sun Villiers 125 (1951-53)
1955 AJS 16MS (1955-56)
1952 Vincent Comet (1958 - 84 .. Not ridden after 62)

Member
Online
Posts: 6261
Joined: Wed Sep 01, 2004 12:00 am
Location: WEST SUSSEX UK

Re: Convert dynamo from positive to negative earth ..

Postby SPRIDDLER » Mon Nov 11, 2019 12:55 pm

Taid wrote:
I've got the Smart Turn and Smart Brake System stuff .........

Ah, right, that's a new one on me. Very elec-trickery. I had to look it up:

https://safer-turn.com/smart-brake-module/

The Smart Brake module uses accelerometer and motion detection sensors combined with proprietary algorithm to detect when you are engine-braking or down-shifting.

It’s an intelligent system that doesn’t interfere with the actual brake light operation.

It simply senses when the bike is slowing down and operates the brake light in the situations when you’re not actually applying the brake.


Hmmm........ :?
I poke badgers with spoons.

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Re: Convert dynamo from positive to negative earth ..

Postby Taid » Mon Nov 11, 2019 1:03 pm

SPRIDDLER wrote:
Hmmm........ :?



Until I bought this bike a month ago, I hadn't ridden a bike more than a hundred yards for over 55 years .. I figure I need anything that could improve my safety ..
Nostalgia taking over ..

Currently ..1957 AJS 16MS .. Restored/registered 1987

Previously ..
1951 Sun Villiers 125 (1951-53)
1955 AJS 16MS (1955-56)
1952 Vincent Comet (1958 - 84 .. Not ridden after 62)

Member
Online
Posts: 6261
Joined: Wed Sep 01, 2004 12:00 am
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Re: Convert dynamo from positive to negative earth ..

Postby SPRIDDLER » Mon Nov 11, 2019 1:16 pm

Totally agree with that. My 'Hmm?' was to give it some thought as I know to my cost, having lost the use of my right arm and hand after being hit by a lorry nine years ago and can only ride now after fitting a dual clutch and brake lever unit. One needs all the safety stuff available when you're down to your last arm ;)
(The flimsy top brake cable was a temporary experimental one).

K-Lever on Marigold (640x480).jpg
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I poke badgers with spoons.

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