Having low voltage on my 2001 Chevy Tahoe after installing LED lights

The charging system needs to be checked out. Sounds like it is not charging the battery.

Or you have a parasitic draw on the battery.

Someone told me about some sort of little clip things I don't know what he was talking about and I haven't talked to a mechanic or anything about it something about it a little clip that goes on the bulb when you put it in the Outlet I think I said that right I don't know but I do know I like having the LED lights alternator is good charging good but battery shows low voltage and it shows the battery is bad I think I just need to take it too freaking mechanic. Haha something else I've got myself into that I know nothing about thanks anyway or if you have any more suggestions I'm very open for them thank you

If it was okay prior to installing the LED lights, take them out or disconnect them to see if the voltage problem goes away.

If you are sure the LED lights are installed correctly, it may be that you need a bigger alternator. Never the less best to take it in to have it checked out.

Might be the testing instrument that you are using