What fuse in a 1988 camaro is always on?

Modern vehicles have 12 volt ports inside that are run off the battery just like Gene illustrated in his explanation of this, and his is the best explanation I've ever heard/read. I've run radios, radar detectors, and even AC units like this before. The only add I could provide is that the starter nub is the end of the battery positive cable, and I'd just add the wire to the other end, at the battery, it's a lot easier. And you really have to add that inline fuse.

brake lights , horn , headlights are hot at all times . The fuse may get powered by a relay so there won't be a static 12 V on it . Use an inline fuse for what you're doing

Not to beat a dead horse, but..... Many of today’s vehicles have 12 volt ports inside that are run directly off the battery through a fuse, and their fuses are always on. Any device, like lights and horn, that can be used when the engine/alternator are not running, get power from the battery and their fuses are always on. But these devices use relays to operate, so they’re not really considered as always in receipt of electricity..... Modern cars come with a plethora of accessories, and have a limited number of add-on packages. Their fuse boxes, no matter what’s included, look the same, but internally, the boxes contain only the electrical, or fuse connections/holders, that are required for that iteration. So a basic car will have the same fuse box with labels for every possible addition, but not have the electrical fuse holders for devices/packages that are not included. It’s possible to remove the fuse box and add fuse holders to vacant spots in the box so you can add devices. Say you want to add an audio amplifier. You can modify the existing fuse box to add this or you can simply run a separate wire with in-line fuse off the main power upstream of the fuse box, which would be much easier..... Older cars, like up to the 1970s or so, had base models with many individual optional devices rather than including just one or two optional packages. Their fuse boxes were all the same internally. So if your car didn’t come with the power seat option, the P.Seat fuse location will have the fuse holder in it, electrified so a fuse could be added for that circuit. To add a different device, like cruise control or fog lights, you could just install a proper fuse in that space and wire the device into that space through the back of the fuse box..... To determine which fuses are getting fed electricity all the time, use a multi-meter to find them. In older cars, you can easily add a fuse. In newer cars, you can go into the fuse box and add a fuse holder in any empty space and wire it to the line supplying power to the box or jump from another fuse location.