Battery Isolator Switch...

[Bassfiend]

My 4.0 HC has a battery isolator switch in the engine bay on the nearside inner wing about halfway between the Airflow Meter and the front bulkhead ... is this something that all of them have or is it something someone has had fitted to mine? Also, what exactly should it isolate? I was hoping I could use it to stop my alarm draining the battery over the space of a few days but it seems that even if I switch the isolator over to what I assume is "isolated" the alarm and immobiliser are still powered as is the clock etc...

Phil

[JonathanT]

is it a manual isolator for the starter motor?