Re: 9-0-9 DC Ammeter (Application?)
Tractor dynamos were often totally enclosed to avoid dust and chaff entering the machine. This resulted in a derating to around 50% of the equivalent ventilated dynamo. The standard dynamos in the UK were rated at 19A, later 22A, so that tractor versions would be around 9 to 10A.
This however was on 12V systems. Standard US practice was to use 6V systems on cars long after current demand created difficulties with dynamo commutation.
My impression is that American tractor manufacturers did not fit any more electrical equipment than absolutely necessary and I would not be surprised if many tractors had only a single headlamp.
PMM
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