The white wire that hooks up to your reverse relay comes from the engine alternator and once the reverse relay energizes it sends 12 volts through the black wire at that same relay, over to your pto. So you should be seeing 12 volts at the brown wire and also 12 volts at the white wire, at your reverse relay and also 12 volts at the black wire comming out of the relay on to your pto.
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