Author Topic: Dynamo Charging or Not?  (Read 339 times)

Offline petetherev

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Dynamo Charging or Not?
« on: 25.08. 2015 18:26 »
Hello, I'm rebuilding my Tiger100 engined Gold Star which I originally built nearly 50years ago and has not run for 30 years. I have been trying to decide if it is worth fitting an electronic ignition or not, if I went electronic I would have gone to 12v as well.  However I have finally decided to keep the mag which need the armature rewinding (I found Brightsparks Magnetos web site very informative and Bill Brown very helpful).  So now, go 12v or stay with 6? My dynamo, running it on the bench using an electric drill will generate about 9.5v but it will not light a  bulb, I expected it to at least show sign but nothing.
Field windings show about 2.8 ohms which I believe is OK.

Any Ideas please

Thank you
Pete
 
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Online Triton Thrasher

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Re: Dynamo Charging or Not?
« Reply #1 on: 25.08. 2015 20:14 »
Are you connecting F and D together, for your bench test?

Have you tried both directions of rotation?
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Offline petetherev

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Re: Dynamo Charging or Not?
« Reply #2 on: 25.08. 2015 20:42 »
Hello thanks for your reply.  In answer to your questions, Yes, I did connect F & D and No I did not try rotating in the other direction as I worked when last run about 30 years ago so the polarity should not have changed and I was not sure if by doing so it would change the polarity.

Thanks once again
Regards
Pete
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Online Triton Thrasher

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Re: Dynamo Charging or Not?
« Reply #3 on: 25.08. 2015 20:49 »
I wouldn't be 100% certain it's still got correct polarity after years of storage.  Put 6V live to F and the other side of the battery to the dynamo casing for a couple of seconds.

Rotation direction should be correct of it's been on that bike before.

Clean the commutator and see that the brushes slide freely in their holders.

How much rpm does the drill provide?
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Offline petetherev

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Re: Dynamo Charging or Not?
« Reply #4 on: 26.08. 2015 16:34 »
Hello Triton Thrasher, I have 'Flashed' the dynamo and run it as a motor, and its all clean inside.  The odd thing is that it now only gives 9.25v as opposed to 9.5 before I flashed it.  It still  does not light a bulb however.  As for the speed of the drill, its a variable speed drill which I have had for years and the label  is a bit worn it looks like it could be 3000rpm, but if the dynamo goes under load it will show down.
Thanks for your help I will probably end up replacing the insides, the decision being 12 or 6v.
Regards
Pete
PS Do you know  why this topic was  moved, its a technical problem?
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Online bsa-bill

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Re: Dynamo Charging or Not?
« Reply #5 on: 26.08. 2015 17:34 »
Quote
3000rpm,

a quite good speed for a drill these days, I'd guess a Bosch or better

I have one bike on 12 volt (electronic ignition at present) and one on six, both changed to negative earth for the sake of pandering to my memory.

I don't do any night riding now so I'd be happy with 6 volt on the Flash (the other requires 12 for the Pazon ignition)
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All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

beezermacc

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Re: Dynamo Charging or Not?
« Reply #6 on: 26.08. 2015 17:58 »
I suspect the topic was moved because its a Triumph engine / Gold Star and this is an A10 forum so your bike doesn't qualify other than in Chat / diverse.
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Online trevinoz

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Re: Dynamo Charging or Not?
« Reply #7 on: 26.08. 2015 22:27 »
Pete,
                       How is your dynamo loading up if it won't light a bulb?
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Offline petetherev

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Re: Dynamo Charging or Not?
« Reply #8 on: 27.08. 2015 20:41 »
Fair Comment Beezermacc. I am not trying a take over it's just that this is a good forum and electrics seem to be universal.

Regards
Pete
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