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I'm looking at installing a Taylor or Morosso battery relocation box in my supra, and it needs to abide by NHRA rules regarding the cut-off switch (see below). Basically the switch must be positive, it must be on the rear of the vehicle, (and the hard part
it must kill all electrical functions when switched.
So obviously you have the positive terminal routed to the switch, but what else? Do you just cut the positive alternator lead and run each side of that cable to the switch? On Larry_A's site, he wired the starter too? :scratch: Should fuseable links be mounted at the battery, or in the engine compartment?
and my last question -- how safe is it to have a positive switch routed at the rear of the car? I mean NHRA doesn't exactly see a lot of rear-end accidents, but I've been hit once at a stoplight, and could theoretically see spinning on a track and backing into a wall. If such a crash happened, I wouldn't want my "safety" switch grounding out and causing sparks right over my fuel tank...
Thanks,
Jeff
PS, I asked this question in Drag Racing 2 or 3 days ago, but haven't actually recieved a reply since I learned the switch must be positive
So obviously you have the positive terminal routed to the switch, but what else? Do you just cut the positive alternator lead and run each side of that cable to the switch? On Larry_A's site, he wired the starter too? :scratch: Should fuseable links be mounted at the battery, or in the engine compartment?
and my last question -- how safe is it to have a positive switch routed at the rear of the car? I mean NHRA doesn't exactly see a lot of rear-end accidents, but I've been hit once at a stoplight, and could theoretically see spinning on a track and backing into a wall. If such a crash happened, I wouldn't want my "safety" switch grounding out and causing sparks right over my fuel tank...
Thanks,
Jeff
PS, I asked this question in Drag Racing 2 or 3 days ago, but haven't actually recieved a reply since I learned the switch must be positive
8:1 Batteries
All batteries must be securely mounted. Batteries may not be
relocated into the driver or passenger compartments. Rear firewall
of .024-inch steel or .032-inch aluminum (including package tray)
required when battery is relocated in trunk. In lieu of rear firewall,
battery may be located in a sealed .024-inch-steel, .032-inchaluminum,
or NHRA-accepted poly box. If sealed box is used in
lieu of rear firewall, box may not be used to secure battery and
must be vented outside of body. Relocated battery(s) must be
fastened to frame or frame structure with a minimum of two
3/8-inch-diameter bolts. ("J" hooks prohibited or must have open
end welded shut.) Metal battery hold-down straps mandatory.
Strapping tape prohibited.
8:4 Master Cutoff
Mandatory when battery is relocated or on any vehicle running
9.99 or quicker. An electrical power cutoff switch (one only) must
be installed on the rearmost part of each vehicle and be easily
accessible from outside the car body. This cutoff switch must be
connected to the positive side of the electrical system and must
stop all electrical functions, including magneto ignition. The off
position must be clearly indicated with the word "OFF." If switch is
"push/pull" type, "push" must be the action for shutting off the
electrical system, "pull" to turn it on. Any rods or cables used to
activate the switch must be minimum 1/8-inch diameter. Plastic or
keyed switches prohibited.