Battery Isolator switch

Hi there Guys'
can you please tell me the best way to connect up
i.e. battery pos to iso switch to starter motor, is this the correct way?
many thanks
regards Scrumpy

Yes.

I would mount the switch to the front of the passenger side seat box, near the handbrake, then cut the original heavy positive cable and connect that to one side of the switch, then the other side of the cut cable to the other side of the switch, I would also make sure that you run a fused link across the switch say 10 amps, this will mean that with the isolator in you can still run some electrics and keeps things like the clock going.

Some people mount them in different places which usually involve running new lengths of main positive and I know I don't want any more unfused heavy positive cable than I need to have so keep it simple, if you do put the cable elsewhere, use good cable, properly rated and then some, and run it in that convoluted sleeving or something. http://www.vehicle-wiring-products.eu/VWP-onlinestore/sleeving/sleeving.php#conv

If coming from your battery you have a heavy positive cable and a smaller positive cable you may not need this, however if you tried to start the engine if there is a path to the starter motor positive it will try to take power from this smaller cable and it would fry it. Someone may have added a live feed for something, doubled up on the alternator return wire etc... all these things need to be carefully checked out before hand.

Single positive cable then wire right in.

If you wanted to keep it really simple you can buy a battery terminal clamp with isolator built in. Cheap and effective but means you have to access battery to isolate

remember if you cut the battery wires as above it will not 'cut out' the engine if it is already running as the alternator will feed the lectrics, you will need an FIA cut out switch with ballast resistor or add your own. Also without a ballast resistor you can damage the alternator if it is knocked by a passengerby mistake. Yes this happens frequently but have made a device to stop that now. Remember that if ypu have a winch it will need to handle lots of current my switch is 200Amps @24V.