Welcome to 2CarPros.
The fuse is a 15 amp fuse in the under hood fuse box and a 10 amp in the vehicle. See pic 3. However, since the high mounted light works and the cruise control works (great test by the way), it isn't a fuse issue. The high mounted light gets power from the same place as the others.
With that in mind, I attached a portion from a wiring schematic. The pink wire on the left supplies power to the brake lights. Now, I circled a joint connection where the wires converge. It is behind the left kick panel (next to your left foot when in the car). You need to check the condition of that connection to make sure nothing is loose, corroded, or damaged. If you follow the green wires from the connection, you will see that power goes to the high mounted light and both brake lights on the sides of the vehicle. So if one gets power, they all should.
So, the only other thing that I can see that would affect both side lights and not the 3rd is ground location. If ground is lost, but if that was the case, none of the lights would work. If you look at pic 2 it shows that ground for both sides and a different one for the third brake light. If you question that at all, confirm the back up lights work. If they do, the ground should be good.
Check those things first and let me know what you find. Here are a few links you may find helpful:
https://www.2carpros.com/articles/how-a-car-fuse-works
https://www.2carpros.com/articles/how-to-check-a-car-fuse
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
https://www.2carpros.com/articles/how-to-use-a-voltmeter
https://www.2carpros.com/articles/how-to-check-wiring
I hope this is helpful. Let me know what you find or if you have other questions.
Take care,
Joe
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Saturday, August 17th, 2019 AT 6:21 PM
