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Re: When to upgrade to high amp alternator?
Typically LED lights draw far less energy that comparable incandescent or halogen bulbs. I wouldn't guess the LEDs were source of voltage drop in and of themselves. My recommendation is to use a DVM to test voltage drop at the headlight connectors or other power terminals that you may be drawing excessively on your system. Also test the alternator directly.
My 2¢....
Dan
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Forgive my typos, big fingers and little Android digital keyboard....what a mess 
06 GMC Sierra crew cab Z71 DD leveling kit, 34's, bumper, LED lighting. Still doing stuff to it.
67 El Camino Custom 300 Deluxe. In progress.
55 GMC 371 2 1/2 ton. Upcoming project.
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