Hot wire?

So I got a 07 9400i. I'm trying to tap into my work lights to run new ones... problem is they won't power my leds. Is there away to make that wire produce more power without melting them lol

On my muiltmeter it's only doing about .12....

 

I have it grounded to a bolt outside. If i take the wire i ran from my LED light and touch to the Battery it works but taping into the old Wiring that already has a switch it won't power the led. Im trying to avoid having to run another wire & Switch

 

yeah im sure its grounded out on a bolt that has a Really good ground. If i touch hot wire to the battery powers right up. But soon as i hook into old wire it won't power it. Im still getting .11 from my muiltmeter at the top where the new work lights just wont power em. Didn't think LED would need more power then what its getting lol

 

Correct Yes the old ones work fine. They power up.. Its what got me stumbled lol

 

But at the Top where they wire spices into led im getting the same .11 - .12 there same as where the original spice in it is. Im thinking that the wire just can't handle it.