I always thought pin 4 on a 7-way plug was the 12 VDC pin. Did you verify the 7-way was fully wired and not just wired for lights and brake lights?
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Ed & Bev Felker
Retired USAF Col and retired Nurse
Traveling with Lily & Bella ('Teddy Bear' breed)
2015 Vegas 24.1 (E-350)
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