I'm not interested in a "MirrorTap" or "InvisiCord" solution. I'd like to use an "Add-A-Fuse" and run power from a switched circuit (vs. an "always on" hot circuit) in the fuse panel (so the detector isn't on all the time).



Which fuse slot (in a 2011 F-150 SuperCrew in case it matters) are you all using? (#37 was mentioned once in the archives)

And are you using an empty (but wired with gold contacts) fuse slot, or piggy-backing on an existing fuse slot for an active accessory?

Also, did you use a standard full-size fuse or a mini-size fuse?

 

This is what I do with my vehicles. There are plenty of unused switched sources in most cars, owners manual will highlight them, so just tap into one of them. They should all be mini fuses inside of the SJB so you would use a mini fuse.

 

You are looking for fuse 37. It's a 10 amp, spare fuse in your panel.

The fuses are mini-fuses. I used this particular tap-a-fuse model: Wirthco 30103 Tapa-Circuit- Mini

You can also find another product, same thing / different name: Littelfuse FHM200BP ATO Add-A-Circuit Kit