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I don't have any voltage on the 4 pin trailer hook up for my parking lights. Signal lights ok. All fuses in both fuse boxes ok. Thought any relays would be located before the fuses rather than after. Would appreciate any suggestions and/or a wiring diagram that may help. Thanks in advance!
 

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I'm having the exact same problem with my 2016 Dble Cab. In my case, both the flat 4 pin and round 7 pin have no voltage at the tail lights position---all other positions are good. I've checked the trailer with a spare battery and all is good there. Where did you find the trailer plug fuzes?
 
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