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I'm installing a double-DIN head unit to replace the MyGig and I have a question about the reverse signal cable. According to the RP4-CH11 instruction manual, it says that the green wire coming off the chassis harness is: Reverse Output (+). With this wired in to the new head unit the screen always goes into reverse mode when the ignition is turned on. When in accessory mode, the unit operates normally. Does this wire actually provide a positive reverse signal?
 

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