1933/34 dynamo cut-out

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Re: 1933/34 dynamo cut-out

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Dhbangham » 20 Jan 2019 08:38 am
Hi Tony, I will discuss your problem with some friends who are meeting this morning and get back to you later. I had my cutout completely re-built by Paul and he made a lovely job of it. Do you have a three brush dynamo? Cheers Daniel
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Re: 1933/34 dynamo cut-out

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Barry wrote:........while the dynamo puts out the specified 8 amps when underway, my halogen bulbs draw 10amps!
I know Daniel has LED in his.......,
Thanks for the replies chaps, I'll be very interested in the outcomes.
Above is part of Barry's post which I'm going to include in a new thread in the Pre-war section under 'L.E.D. bulbs for Pre-war Jowetts.'
Anything to get the discharge down must be beneficial.
Perhaps Daniel would like to comment.
Tony.

P.S. Haven't been able to create a new post as yet, but KC has been informed.
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Re: 1933/34 dynamo cut-out

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by Dhbangham » 20 Jan 2019 02:07 pm
Hi Tony,
Have you check what the dynamo is delivering. ie is it delivering around 14volts at fast tickover. If not, then it may be the dynamo that is the problem.
Cheers
Daniel
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Dhbangham
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Your interest in the forum: Jowett long four owner. Jowett club member. (Former Armstrong Siddeley 20hp 1932 owner and ASOC member and former Lancia Belna 1935 saloon) Lanica owners club member. Interested in driving my cars especially in europe and making and repairing parts for the cars. I consider myself an oily rag owner.
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Re: 1933/34 dynamo cut-out

Post by Dhbangham »

Just caught up with the conversation.... The way I am thinking is a) Check what voltage is coming from the dynamo. If it is around 14volts then all is well with the dynamo(probably). This voltage is enough to trigger the cutout switch and put out the ignition switch. If voltage at dynamo is low, then that is your problem. b) The voltage is high, then can you manually move the solenoid switch with a cocktail stick? Try with engine off and then when running. If it does not want to move, then it is probably a mechanical problem with the cutout. c) If it does move, then start the engine manually trigger or flip the switch and see if it remain latched? If not, then it might be that the solenoid coil is faulty or there is a resistance in that bit of the circuit.
Regarding total current needed to run the car, then careful choice of bulb wattage in all light and indicators is important and I have indeed used special LED bulbs in the headlights. I also added, not substituted led lights for the brakes.
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Tony Fearn
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Re: 1933/34 dynamo cut-out

Post by Tony Fearn »

Thanks for the replies. BG seems to have sorted himself out, and I've asked him to let me know any relevant details when all is finished. I will post them here if relevant.

This is from another thread in the pre-war section which KC posted some time ago, but perhaps it won't be amiss to reproduce it here.

http://www.austin7.org/Technical%20Arti ... refresher/

Tony.
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