What the others have told you is partially right and partially wrong. I have been wiring these things for over 30 years and they can get confusing, because all manufacturers of trucks do not use the same color code. The seven pin connector is what is commonly called an RV plug and the codes for it are not the same as for the 4 prong or the six prong round plug. The codes for the 7 prong are: Red-left turn and stop Brown-right turn and stop Green-Tail lights and marker lights Black- AUX. -12V Supply Blue-Elect. Brakes White- Ground Yellow- center pin Back-up lights This is the way that newer Ford -GM and Dodge Trucks are wired from the factory and any newer RV is wired from the factory. This does not however mean that a red wire on your truck will hook to the red position in the plug. That is where a test light comes in. You have to check your harness on your tow vehicle and make it match up with the the code in the plug. IF your truck has seperate brake and turn signals it is another ball game,you will have to buy a tail light converter to be wired in also. All of this should be enough to totally confuse you but good luck.
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