...if you use the Zero cigaret lighter option...($50), the wire attached to it looks maybe 12 inches long...so the connection should be near the front.. maybe.
is the location of the SAE connector on a 2016 DSR in a different place?... a few old post have different locations and ways to access it.
The SAE connector may or may not be accessible, it is tucked out of the way. Remove the seat, and cowl, is an easy task you should have those tools with you anyways if you ever need to work on a bike roadside because of some problem. If you first want to try removing the headlight and the dash that's easy to try. You are hoping that to remove the headlight and dash will give you a better look and maybe see into the cowl area without having to open the cowl area? There is a chance the SAE connector is loose in just the right spot for you to see it from the headlight area? 100% success if you remove the seat and cowl, because that is where the wiring is. Removing also the headlight will help installing any accessory but it is not the only step in the process.
What I carry with me always on my Zero:
$6- T45 bit for the seat bolt
https://www.amazon.com/gp/product/B000E60O4C$38- Midget wrench kit for metric motorbikes
https://www.amazon.com/gp/product/B01BU96ENQAlso I carry a 6mm and 8mm allen key wrench because the midget wrench i.e. is good for the torque of the seat bolts (16lb-ft) but not the handlebar clamps (19lb-ft).
This isn't weird, everyone with a Zero should know how to do these things, but it is good to ask questions first and not randomly take apart a $15,000 motorbike! On the Zero, most things you take apart can be put back together easily if you are using a wrench. When you use a wire cutters or electricity "tap" and start making changes to wiring directly because you are afraid of a few nuts or bolts, that is when things get crazy and bad very quickly.