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This is a guest post from Alan Clark…
Here is a detailed explanation of the reason a Series Wound starter motor still rotates the same way regardless of battery polarity.
When Battery Polarity is reversed both Field and Armature currents are reversed [Because it is Series wound]-rotation direction remains the same.
If the Starter were to be dismantled and either the field or the armature connections reversed the Starter rotation would reverse
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Myself and a mate have started to refurbish an old fordson super dexta. I would love your help. at the moment we just want to try and turn it over we replaced the solinoid on the starter because the old one was not working. its not the original starter its a modified one. we need to know the correct method of wiring it. can you help ??