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Wiring a relay to the brake switch will allow you to put the converter in high stall for stoplights in a car with a radical camshaft. It is important to make sure that you splice into the brake switch on the side that is controlled by the switch and not the side that has continuous current. Failure to do so will result in you stall converter always being in high stall mode.

Here are a few different options for controlling the converter.

1. Use a timed delay box to have the converter go to low stall after you leave the starting line. These can be had from several different vendors.
2. An RPM switch could have the converter lock up once your car is into its power band. Using something like the an MSD RPM switch for this would be a quick and easy setup.
3. A simple switch can be used to allow full driver control of the system. For most those who want to have the most control of their driving experience this probably the best option. A nice shifter mounted button switch would make this a no-brainer.

If you decide to use one of these options simply put it in place of the simple toggle switch in the diagram above or use a 3 way selector switch and try several options.