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John Fernihough wrote:
Massey Ferguson 130 Tractor 1966.

The battery, only 6 months old, keeps going completely flat. All electrics disconnected, except starter motor and dynamo. All wires appear sound, clean etc.

Any idea of cause?

Hi John,

Have you disconnected the regulator box? That could be the cause of the problem.

Remove one battery lead (battery fully charged) then inbetween the lead and the battery terminal place an ammeter in the line. See if there is a reading, which will inidicate an electrical discharge (flow of current). If no flow registers then it is the battery.

You could swap the battery onto a different tractor and see if the problem goes with the battery.

Hope that helps,