Subject: Master cutoff switch - cut the positive or the negative? (or both!)
rj and revilla have been discussing this and I'm curious if anyone else out here has views / experience?
It is clear (I think!) that from a race safety perspective to cut the negative is the safer option; principally I think because cutting the neg right by the battery disables all possible fire sources which derive from all the unfused uncut wire section(s) (like the battery side run to the master switch).
However, that's not the popular option; presumably because it's not what CC deliver.
Also involved in this is using a physical cut like we are used to:
or using an electronic cut using one of these: http://www.brise.co.uk/Battery-Isolator-EV200-H.html (the farnel version is now about the same price.) Wiring seems to get complicated if ecu/alternator protection is desired.
The conversation flows around complexity, ballast resistors and whether destroying alternator and ecu is acceptable (which in extremis it is), but I don't want that option.
"I" am about to rewire my engine loom etc, so this has my attention.