injectors and noid lights

[mrelmo]

ok here is a copy of testing injectors with a noid light without removing the plenum. follow the injector wires over to the harness connector and test from there. my question from here, as i have never used a noid light is, do the contacts on the back of the light have to touch a bare contact or wire or does it pickup an electical signal through induction if you know what i'm trying to say. thanks your help is greatly appreciated

[maxwedge]

You need direct continuity for them to work.

[mrelmo]

thank you