Ford F-Series Superduty: Troubleshooting Trailer Battery Charge Circuit. 

the only video out there that actually explains and helped on this issue thank you

You are a fine human being my friend! I totally could not figure out why there was no fuse in the #27 position labeled " trailer tow battery charge (if equipped)" I was thinking my $75k dollar F350 didn't come equipped with a trailer charge line!! WTF!! Your video was amazing and right to the exact point of the same issue. I've since re-labeled the manual on #65 fuse😊. Thank you so much my friend. Huge help!!

There are 2 different standards. The one is rv std wiring colors that you are seeing and then there id S A E wiring colors like on 4 prong plugs.