Did you check the rear of the fusebox to see if that fuse point had a supplying wire to it, as it should have a large feed wire & this will be attached to a long bar that provides that row of fuse slots with the feed power, then you connect your module/unit out to the other fuse leg, thus oem fitment.
IIRC, some lower spec cars might not have as long of a feed bar in each row to provide all the said fuse slots, so you can either replace the bar with longer one(bitch of a job) or repair wire/crimp/solder to make slots live.
As my car had a fair spec already, I had all slots live iirc, so I went down that route for oem fitment, I just got the repair wires from audi & made the outward leg to the new modules live in the rear for in/out & then added the fuse in front, this then follows the car manual when comes to fuses blowing or need checking.
TBH its always better to use the said fuse slots as the supply wires to that strip are gauged for the current, if the live spare fuse slots are in the same row/slots as the ones not available, then yes you can use these as they are of course the same original feed wire from under the hood.
IIRC, some lower spec cars might not have as long of a feed bar in each row to provide all the said fuse slots, so you can either replace the bar with longer one(bitch of a job) or repair wire/crimp/solder to make slots live.
As my car had a fair spec already, I had all slots live iirc, so I went down that route for oem fitment, I just got the repair wires from audi & made the outward leg to the new modules live in the rear for in/out & then added the fuse in front, this then follows the car manual when comes to fuses blowing or need checking.
TBH its always better to use the said fuse slots as the supply wires to that strip are gauged for the current, if the live spare fuse slots are in the same row/slots as the ones not available, then yes you can use these as they are of course the same original feed wire from under the hood.
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