here's another question for you all...

I have a battery isolation switch that I intend to fit to my car (not the type with a red key, as used in motorsport - this is a rotary one that's going on the firewall behind the dash.)

Physically the easiest lead to break into is the negative (chassis) one. Electrically it makes no difference which lead I disconnect, but is there any convention or hidden peril in breaking the negative lead instead of the positive one?

cheers,

David

Would connecting to anything other than the positive side of the circuit have any effect on the alternator diodes. I assumed the reason for this was due to the FIA Regulations and they are there for a reason...

Course - I stand corrected...

Put it on the earth, and put a 5A fuse across the terminals, all systems will still work unless the starter is applied!

Knowing me, I'll see the imobiliser light and try to start it!

My car's got very basic electrics - the only thing running when the car's stopped is the imobiliser, and I don't care if that's cut off when the switch is operated...

rgds,

David