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Trying to find a wire harness to tow a camper with a 7 blade connection. I do have the tow package on mine but cannt seem to find a connection for it.
 

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As far as I know the "tow prep package" on the Sienna didn't include either the hitch or the trailer light wiring. When I installed my hitch, I bought an aftermarket "plug and play" wiring harness for my 2013 that has a 4 pin connector. I bought both at: etrailer.com
 

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Most 7-way harnesses I've seen or at least considered were set up to accept a connector from a 4-way harness. If you bought one of those types of 7-way harnesses, you would first install a 4-way harness and then plug the output connector from the 4-way into the 7-way harness. Then you run the additional 3 wires on the 7-way harness independently to power, brake controller and ground. There a lots of good plug-and-play 4-way harnesses. I've bought most of my trailer towing stuff from https://www.etrailer.com/ which has people who can make recommendations if you contact them.

Member javvy recently posted a link to a video showing his 7-way on his Sienna: https://www.siennachat.com/threads/my-2015-towing-prep-and-towing-close-to-4000lbs.62175/

javvy used a Hopkins 7-way harness that has ports on the external mount for both 7-way and 4-way connections.
 
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