Most end up failing that test as alternator back feed keeps the engine running.
Not the charge wire, just the one that enables the alternator.
Likewise, it's pretty easy on an E30 to disconnect the main wire at the junction block,
run it up the cage to the switch (inside the window, passenger side)
and then run from the switch back to the junction block. I like the switch out of the elements.
The 2002 has the switch on the driver's side. Very easy, very convenient (a corner
worker will always come to the driver first)
but a little scary having the high amperage wire right there in your lap.
An extinguisher is a good idea IF you use a real bracket. Plastic, not such a good idea. Honestly, you're most likely
to use it in the pits, or after you've gone off- track and gotten beached, as Jeremy says.
The in- car system is probably better for engine fires.
I've raced a fair bit, and I'd say that 98% of the time, it's most- handy to be able
to point the bottle at what's on fire. Our club rules mandate 10 lbs of extinguisher
in the pits, and that's not a bad idea- I have two #5's...
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