12V Wire To Tap Into For Accessories?

It all depends on how much current your various accessories draw, and what that adds up to. Have you looked up that information and done the addition? What do you get? If you're within the capacity of that circuit, no worries.

I'm glad you'd rather. Increasing the size of the fuse is never a (sane) option. Toyota knows the heat-withstanding ability of the wires they used, and that's how they chose the fuse they chose.

It is always a sane option to study your car's wiring diagram on techinfo.toyota.com and find where the ACC-switched circuits are sourced from, and what additional capacity might be available on them and where you could tap in. The book shows all the wire color codes and routing and the locations of all the switches, relays, fuses, and other connectors. If you tap in at a major power distribution point, of course you'll want to add a fuse of your own sized appropriately for the wire you are adding.

It's possible that the circuit to the power outlet is the only one they built with very much excess capacity, and the other ACC-switched circuits are sized pretty closely to the built-in stuff that runs on them.

It is also always a sane option to take your new circuit straight off (almost) the 12 V battery, which is easily accessible inside the car, using a relay of some sort to turn your circuit on in the conditions you want. A very similar question was asked just recently, so more ideas can be found there.

-Chap

 

I would suggest using the cig lighter wire as a signal to turn on a relay. This way you don't blow a fuse.