Vic787 Posted September 7, 2021 Report Share Posted September 7, 2021 (edited) All the help I have received with my odd problems have led to renewed TR driving, thanks everyone, you know who you are but I have another request. Why does my Ammeter swing violently - to + and back again then settle to centre position intermittently. I have Dynamo electrics with narrow belt, adjusted correctly. Any advice please? Update..... The battery holds its charge. Vic Edited September 7, 2021 by Vic787 Additional information. Quote Link to post Share on other sites
RobH Posted September 7, 2021 Report Share Posted September 7, 2021 The ammeter should only be responding to current flowing into and out of the battery. Fluctuations like this may be due to switching on or off of some large load (cooling fan?) but may also be a result of a problem with the dynamo or its control unit. If the dynamo bearings, brushes and commutator are in good condition this is most likely a fault in the control box. That is not something to be fiddled with unless you really know what you are doing, but careful cleaning of the contacts with fine glass-paper may help, provided the mechanical adjustment is not changed. Modern reproduction control boxes are known for unreliability, as the contact materials are often not to original specification. Quote Link to post Share on other sites
ianc Posted September 8, 2021 Report Share Posted September 8, 2021 There is available a control box which looks like the original but contains electronic parts. From reports on the Forum, these seem very reliable (they ought to be) and probably better than (some) reproductions - see RobH's comment above. I have no experience of these electronic versions - I have an alternator. Ian Cornish Quote Link to post Share on other sites
RobH Posted September 8, 2021 Report Share Posted September 8, 2021 (edited) .....like this for example: http://www.dynamoregulatorconversions.com/reproduction-rb106-and-rf95-regulators.php Edited September 8, 2021 by RobH Quote Link to post Share on other sites
Lebro Posted September 8, 2021 Report Share Posted September 8, 2021 I have one of the above regulators - a 6 volt one, in my 1935 Hillman. works very well. Bob Quote Link to post Share on other sites
stillp Posted September 9, 2021 Report Share Posted September 9, 2021 The ammeter on these cars is a simple moving-iron instrument, and the do swing about a bit. Before spending on the regulator, make sure all the connections on the dynamo, regulator, ammeter, solenoid are good. Don't forget the engine earth strap! Pete Quote Link to post Share on other sites
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