I would not get these lights to begin with. They look very cheap and ship from China. Nothing against china, but you don't exactly get the highest quality stuff there. Hence the reason its so cheap.
That being said, if you do get them, or any other similar led strips, wire them all together, negative to negative, positive to positive. Once you have a single + and - wire for all your lights, negative gets grounded to the frame, or any metal body panel that eventually attaches to the frame in some way. Positive goes to a relay. The relay gets wired as follows:
(Instead of Fogs, it would be your led strips)
30 and 86 go to a fuse, then battery.
87a is not used
87 goes to + on all you led strips
85 goes to a switch, then then other side of switch goes to ground.
You can use a 10amp fuse and 16awg wire. This setup allows the lights to be tired on anytime, even with the truck off. I figure since you wanted these for under the hood work lights, that's how you would want it. If you want it to only work with key, then 30 goes to battery positive with a 10amp fuse and 86 goes to accessory + with a separate 10amp fuse.
I find this wiring to be the easiest, but if you have a switch with an indicator light, then the wiring gets changed as follows:
30- battery + w/ 10a fuse
87- to + lights
87a- not used
86- to switch
Then the other side of the switch gets attached to either battery + or accessory + with a 10amp fuse.
Even 18awg wire is more then enough for some small led strips, but 16 is easier to work with and you can use 14 if you wanna get crazy with it, but it really doesn't matter for lights with such a small current draw. And even a 5amp fuse is probably enough, but 10 will be fine.
Check out superbrightleds.com and oznium.com
They have much higher quality lights at a good price still :thumbup: