04-12-2019, 08:23 PM
Until the cutout operates the light responds to the difference between battery and dynamo voltage. The fact that it dims indicates the dynamo is working weakly. Seven charging system is a common source of problems, often stemming from overloading. The maximum charge should not exceed 8-10 amps on the ammeter, lights off. As advised cleaning the commutator (and leaving cover off immediately after to ventilate) first step. Worn or stuck brushes also common. With a mirror can establish if have reached end of their travel. There have been very many posts available thru Search and which explain all you need to know and more. Hopefully the system is original with no undocumented mods.
(If tinkering it is important not to prod the cutout so that it operates and is left operated)
It is well worth the effort to master the very basic Seven charging sytem. There are several variants and mixes of which can confuse. Info on Club sites.
(If tinkering it is important not to prod the cutout so that it operates and is left operated)
It is well worth the effort to master the very basic Seven charging sytem. There are several variants and mixes of which can confuse. Info on Club sites.