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Here is what I did a few months back:
I got tired of balancing flashlights under the hood of the FJ to see things in low light conditions. Fortunately, there are a couple of spaces on the hood that will allow for installation of some small fog lights (Hella Optilux 1402, obtained on blowout sale from Cabella's) that won't compromise anything when the hood is closed. Yes, it requires drilling/double sided automotive tape/electrical rubber sealant, and screws...... and No, I am not responsible if you do this and goof it up.
One of the spaces is between the radiator cap and the washer fluid reservoir, and the other is in front of the battery. There are corresponding hollow spots underneath the hood that you can use to mount the lights with short screws and double sided tape. I used electrical rubberized coating to cover the exposed drill holes and protect from rust. The lights are slim enough and can be folded back upon their bracket, so there is plenty of clearance when the hood is closed.
I ran the wiring up the driver's side hood hinge and then threaded it between the gaps underneath the hood as shown in the pics. There is a gap between the two sheets of steel that form that hood and this gap works perfectly to run the wires to each of the lights. Because the hood isn't grounded, I ran a common ground wire back from the lights to the driver's fenderwell.
The on/off switch is located in front of the battery and is easy to access. These lights suck as driving/road lights, but they are more than enough to illuminate both sides of the engine bay. Pretty good for ten bucks and two hours of time invested.
One tip: The Hella instructions are wrong on what size hole to drill that matches the screws contained in the kit. Use a 5/64th drill bit, not what hella requests. I can't remember what size they stated, but it was too big.
Here you can see the switch. It lights red when off and green when on. Easy to find in the dark.
Wires were ran up by the drivers side hood hinge and between the two layers of the hood.
