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CHeck at Murray's or Auto Zone first. THere may be a computer module necessary for a trailer harness. I have '99 Windstar that was an oddball year. Have to special order a module to get it from a 6 light system to a four light system. What's 'special' about the '99 model is it has something called a 'floating ground' (whatever THAT means!!). But, there are a number of other vehicles that do require a special module so as to not bugger up the onboard systems.
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