Quick question about testing electricals

[ILLaViTaR]

I need to test my TFI module and other components with a multimeter.

Do I disconnect the negative battery terminal whilst doing this.

I tried it before and got no reading from the multimeter (probed pins 4 and 5 of TFI connector). Does the battery have to be on?

[aussiblue]

See my reply in your other post.

[ILLaViTaR]

Thanks apparantly since the engine starts I don't need to touch it