Convert dynamo from positive to negative earth ..

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Re: Convert dynamo from positive to negative earth ..

Postby Taid » Mon Nov 11, 2019 1:28 pm

SPRIDDLER wrote: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


Very busy left hand you have there S .. (lost in admiration) .. It was riding one handed, signalling to turn right, that made me decide I needed flashers, and knowing my grey pudding, I looked for a way to automate the cancelling .. that's where/when I came across the STS and their SBS ..

Ps .. how do you get the machine on the centre stand (or do you only use the prop?) .. It's taking me a while to knack back..
Nostalgia taking over ..

Currently ..1956 AJS 16MS .. HSU 414 .. registered 1987

Previously ..
1951 Sun Villiers 125 .. ODH 770 (1951-53)
1955 AJS 16MS .. ROF 8 (1955-56)
1952 Vincent Comet .. LOF 858 (1958 - 84 .. Not ridden after 62)

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Re: Convert dynamo from positive to negative earth ..

Postby SPRIDDLER » Mon Nov 11, 2019 1:44 pm

I only use the prop stand and have to make sure I can ride out from a parking place - often it means along a pavement (or on one occasion threading between diners at pavement café tables in Spain).
Riding's no problem; it's manoeuvring that's tricky as if I tried to push it one-handed I'd just go round in a circle. I do topple over now and again.
I poke badgers with spoons.

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Re: Convert dynamo from positive to negative earth ..

Postby bitza » Tue Nov 12, 2019 12:38 pm

DVR 2 REG. And I fitted a isolating switch in the positive side.

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Re: Convert dynamo from positive to negative earth ..

Postby Taid » Wed Nov 13, 2019 11:38 am

bitza wrote:DVR 2 REG. And I fitted a isolating switch in the positive side.



That's the way I'm going .. now got a surplus DVR2 Positive Earth version ..

Moral .. Plan twice .. Buy once ..
Nostalgia taking over ..

Currently ..1956 AJS 16MS .. HSU 414 .. registered 1987

Previously ..
1951 Sun Villiers 125 .. ODH 770 (1951-53)
1955 AJS 16MS .. ROF 8 (1955-56)
1952 Vincent Comet .. LOF 858 (1958 - 84 .. Not ridden after 62)

Member
Posts: 173
Joined: Mon Oct 07, 2019 2:35 pm
Location: Shropshire UK

Re: Convert dynamo from positive to negative earth ..

Postby Taid » Fri Feb 28, 2020 6:33 pm

This thread seems to have got off topic quite a way ..

I have now fitted the electronic gubbins and changed the wiring to negative earth to accommodate it and as far as I can tell its self check works ..

Now I have to turn the dynamo to neg earth before I start the engine .. Flashing, though I have no doubt that it works, seems rather sledgehammer ..

Instead of slapping positive from the battery via a fuse, could one be more gentle and have a bulb in line which would limit the current but could be left connected for a while, even possibly connected to provide bias on the first start?
Nostalgia taking over ..

Currently ..1956 AJS 16MS .. HSU 414 .. registered 1987

Previously ..
1951 Sun Villiers 125 .. ODH 770 (1951-53)
1955 AJS 16MS .. ROF 8 (1955-56)
1952 Vincent Comet .. LOF 858 (1958 - 84 .. Not ridden after 62)

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Joined: Mon Jan 01, 1990 12:00 am
Location: LONDON UK

Re: Convert dynamo from positive to negative earth ..

Postby clive » Fri Feb 28, 2020 9:17 pm

Stop worrying the sledge hammer works fine. Just brush the cable across the field terminal. So long as you just brush there is enough resistance in the field coil. Done it loads of times. Stick it into the field terminal for any length of time and you may burn the coil out.
clive
if it ain't broke don't fix

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Posts: 173
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Re: Convert dynamo from positive to negative earth ..

Postby Taid » Sat Feb 29, 2020 12:47 pm

Thank you C.

I'll give it a go, maybe later today, and again in a few days, when , hopefully, I'll be ready to try starting the engine ..

There is no way, I suppose, of checking whether it has been successful ..

I've fitted a DVR2 negative earth controller .. any idea what would happen to it if the dynamo had remained positive earth? (OK, so I'm a pessimist :headbang: )
Nostalgia taking over ..

Currently ..1956 AJS 16MS .. HSU 414 .. registered 1987

Previously ..
1951 Sun Villiers 125 .. ODH 770 (1951-53)
1955 AJS 16MS .. ROF 8 (1955-56)
1952 Vincent Comet .. LOF 858 (1958 - 84 .. Not ridden after 62)

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