The top fuse is not powered when the bottom fuse is not installed. The fuse is difficult to insert the first time as the clips are new and not bent. I've had good results inserting the fuse through the thicker clip first. You will need an open barrel crimping tool if you want to use the supplied connectors instead of soldering. The driver's side fuse box in the engine compartment of a 2017 Toyota Yaris will hardly close when this adapter is installed. The one on the passenger side doesn't close at all. Haven't tried it in the salon yet.
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