Okay, that tells me you have a short to ground on that specific wire. If you are providing power to that wire and it lights the tester, the opposite side of that wire has to be providing a ground. Otherwise, the light wouldn't turn on.
If you look at the first pic I attached above, you will see the red wire runs directly to the ignition switch. So, either there is a short between the fuse panel and the switch or the switch is bad.
Here is what to do: The next thing I would do to confirm this theory is accurate would be to check for continuity between the red wire and the negative battery terminal. If there is, then we know that wire is shorted.
You will need a multimeter to perform this. If you don't have one, then we need to first disconnect the battery and then disconnect the wiring at the ignition switch. Once it is disconnected, reconnect the battery and install a new fuse to see if it still fails. If it doesn't, it sounds like the switch is bad. If it does fail, the problem is at some point in the wire itself.
I found an OEM wiring schematic for this and highlighted the wire in question, so you have a reference to what I'm suggesting.
Pic 2 shows the switch and wiring. Both the upper and lower trim covers need to be removed. Before you do this, make sure the battery is disconnected for at least 30 minutes because you will be working around the wiring related to the airbag.
Let me know what you find or if you have questions.
Take care,
Joe
See pics below. Note: Pic 2 shows the wiring. Both connectors from the switch should be disconnected for the test.
Images (Click to make bigger)
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Friday, March 25th, 2022 AT 12:35 PM