Quick Electrical Question

[02_SE_Runner]

So I am doing leds to my interior (door handles and cup holder) so my question is, is ground necessary (bolting to metal/chassis [-to chassis and +to+]) or can I just wire it up normally +to+ and -to-...?

Thanks.
Nate

EDIT: I JUST NOTICED THIS WAS IN THE WRONG SECTION. It was a long night last night.

 

[stevec5000]

So I am doing leds to my interior (door handles and cup holder) so my question is, is ground necessary (bolting to metal/chassis [-to chassis and +to+]) or can I just wire it up normally +to+ and -to-...?

Thanks.
Nate

Normally.