Lights diming, battery?

I wouldn't expect noticeable dimming on lights.
Those days went with dynamos (when choice could be heater fan or lights but not both)

You really need to check alternator output. Should be around 14v when engine running, maybe a touch lower on tickover. Shouldn't be much above even when revving.

Check with multimeter on DC volts across battery terminals.

If suspicious of battery, a load test is best.

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Lights diming, battery?