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Turn the hazards on, access the mirror wiring connector. The power wires for the turn signals are BN/GN and GY/OG. If there is no power to either then its the smart junction box bad. The ground wires are BK/VT and both mirrors are grounded at the base of the right A pillar.
For the trailer turn signals, verify fuse 34 under the hood is good and has power. Again turn the hazards on and see if the left/right trailer turn relays pulse/ Let me know these results.
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