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I want to add a couple of 12v outlets in the cab just above the cupholders.
Each of the two 12v sockets is protected by a 15 amp fuse in the engine bay. I've piggy backed off one of these sockets to fit a double 2.1 amp USB socket so max 25 watts (allowing some losses in conversion). I'm running a dashcam from one USB and intend to fit a GPS speedo into the other. Both permanently wired. Oh, and I have two 12v LEDS for the instrument pod. So the power budget is still over 10 amps. I use the unmodified 12V socket to run the tyre inflator which really gobbles the amps. So much so that switching it on when connected to the tyre (and therefore fully loaded) it blows the 15A fuse. I now start the inflator before connecting to the tyre valve. This gives a gradual increase in load.I would never piggy back, off another fused supply because the circuit is designed for a particular current requirement. I just swapped the two 12 volt sockets for 2 double USB sockets.