[TitaniumTT]

No

I don't like doubling up on circuits like that. If you can trace back the wire from the source that you're tapping into and make sure that the wire is of suffiecent size and completely free of corrosion then sure, it's safe. But are you willing to completely dissasemble the harness and fuse box to check everything? If not, than think about what you're asking that poor wire to do. At the ripe young age of 20+, you want a 16ga wire to power whatever the factory wanted it to, than you want to add another 10A draw to it? I smell a fire in the future

Short of doing that I pull power from unused wires located in the harness, again, assuming it's of the proper size etc etc. For example, use the stereo power source if you're not using a raido. I think it's a 15A fuse and from memory it's a W/Bl wire. Put a 10A fuse in the proper location in the fuse block and you're good to go.

Generally what I do whenever I have a project car or boat for that matter, is run one larger 2ga+ wire to a breaker directly off the battery. From there I generally go to a powerpost hidden somewhere and then off to the starter, the alt, the main fuse block. From that powerpost I can also run aux fuse blocks to power my own stuff that was never intended from the factory or just give it better power. Things such as a fuel pump, ign relay, power for the Motec etc etc etc.