Tried to install this setup on my 2018 Softail Deluxe battery terminals thinking it was going to be a usual “take the seat off to access the battery” and am left confused! Where do I find the terminals now?

 

What kind of setup? There's a factory fused charging/power out cable that's attached to the battery and connected in your pic. Do you need more power than 7.5 amps? You can see the terminals under the seat. The red + has a cap. If you need more then the Owner's Manual has a service and replacement section on how to remove the battery.

 

Its a PIA. Have to go through the side and its difficult to attach the leads given the tight access.
Also, I dont think we can attach battery jump start cables to these batteries given the location.

 

I have a Heritage. Pretty sure it's the same layout under the seat. I've attached a lug to the positive terminal. It's a little awkward but not too bad. I'm planning to add a another one for jump starting a dead battery.

You don't need to get to the negative terminal. You can use one of the ground posts that you can see on the left side of the image at the beginning of the video.

Those ground posts are identified as a "clean" and "dirty" ground. The clean is for sensor grounds and the dirty is for power grounds. I think I saw this in the service manual. Sorry I don't remember which is which.

 

I think I read somewhere to jump start by attaching the lead to the positive post on the starter and negative to a clean ground.

 

You can't get at the starter post or the battery terminals easily on the new Softails to jump them. You need to bring a heavy gauge lead out to connect to. There's a thread going elsewhere on the forum about portable jumper batteries where it's discussed in a video.

 

Thanks Pop for teach g me about these !!
Google screw driver clips ... have no idea what the correct name for them is. Google .. look at images. Little metal clip you slide on the end of the screw driver so you don't loose the screw to neverland