i need a hot wire fom the key switcch of a 1998 f150 thats under the hood
It all depends on what you plan on providing the power to. If it's low power, grab power from a fuse in the under hood fuse box. If it's a heavy load, get power from the battery and use ignition power to fire a relay. The cigarette lighter is a good source if the power shuts off with the key. My GM lighter socket is hot all the time.
Search Ford F-150 Questions
Ford F-150 Experts