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Charging problems

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Charging problems
Alan Offline
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Location: Cheshire
Car type: Race Ulster, 1926 Special, 1927 Chummy, 1930 Box
#1
24-03-2025, 02:41 PM (This post was last modified: 24-03-2025, 06:19 PM by Alan.)
The charging system in my chummy has again stopped working.  The cut out contacts are not closing, but if you manually close them the dynamo starts charging. D+ to earth is 32ohms. D+ to A is open circuit with contacts open 6ohms points closed.  Anyone hot any ideas, I’m wondering now about the switch.
Alan Fairless
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Dave Mann Offline
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#2
24-03-2025, 06:09 PM
With engine running at a speed the cut usually closes what voltage do you have between D and earth and between D on the dynamo and earth? Does the summer charge work on your dynamo? I'm guessing you have a DEL dynamo.
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Alan Offline
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Location: Cheshire
Car type: Race Ulster, 1926 Special, 1927 Chummy, 1930 Box
#3
24-03-2025, 06:24 PM
Hi Dave. No, it’s a mag engine so it has a DFL dynamo. Will check voltages tomorrow.
Alan Fairless
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David Cochrane Offline
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Location: Dunchurch, Warwickshire
#4
24-03-2025, 11:32 PM
Check the cut-out's earth.
http://www.a7c.co.uk
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Alan Offline
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Car type: Race Ulster, 1926 Special, 1927 Chummy, 1930 Box
#5
27-03-2025, 10:25 AM
Cut out body is earthed. I’m not convinced that the secondary winding is ok but not sure I’m checking it correctly. Can anyone advise?
Alan Fairless
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Dave Mann Offline
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#6
27-03-2025, 11:07 AM
The high resistance pull in coil will be in the region of 30 ohms measured between D and earth, if you have a CF1 cut out is the fuse OK?
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AustinWood Offline
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#7
27-03-2025, 02:44 PM
Our cut-out had poor connections between the copper connectors on the back. I soldered them.
Jim
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