Fitting Isolator Switch

As part of security measures I'm taking for my Landy, I'm fitting an isolator switch.

This has become more complicated and difficult than I expected.
There is a large and medium wire which goes to the live on the battery.
I was told that I need to fit the switch to the live feed, cutting the wire and attaching the ends to the terminals on the switch.


Another engineer said I should attach it to the negative wire.
There is only one negative wire, but it is further away from where I will mount the switch on the front of the passenger seat box. So extra cable will be needed for this.

Is there a reason to connect it to the live?
The problem with the live is that I will need to connect both cables.

I cannot find a supplier of the ring terminals I need either, soldering ring terminals would probably be best.

Any suggestions?

If you are going to do this don't forget luxury items like a clock or radio memory will need a constant live to them still.

ivancrx said:

If you are going to do this don't forget luxury items like a clock or radio memory will need a constant live to them still.

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I don't have any luxury items... The head unit doesn't have a key to remember and I have a clock which plugs into the 12v socket, it has a battery to keep the memory...