In a dream world, cars have no wiring at all. The ISIS system is getting close. A single cable connects the panel of switches to the Mastercell and a single wire connects the Mastercell to the Powercell. That's all there is to it. It was so simple we thought we were doing something wrong when we installed it on our 1971 Demon. This quick-install story should cover it.
The Demon has a twin-turbo, fuel-injected 5.7L Hemi with a K1, 392 kit built by JMS Racing Engines in El Monte, California. It uses the Holley Dominator EFI system; otherwise, the car is very basic. We needed the ISIS system to energize the EFI system and drivers, run the fuel pump, electric fans, lights, and start the car. Everything else was handed by the Dominator.
If you are a racer, this should look familiar. The Drag Racing Kit comes with a standard switch panel for energizing components. The difference is the single cable that plugs into the Mastercell. Bolt it down, plug it in, and you are done.
The Mastercell tells the Powercell what to energize. We mounted the Mastercell near the driver kick panel, but it can be anywhere in the car.
1. The yellow cable connects the switch panel to the Mastercell.
2. The black cable connects the Mastercell to the Powercell.
3. On the standard ISIS system, these would be the inputs that control the outputs on the Powercell. In the Alston Drag Race version, the switch panel handles the job.
4. These are grounds for the system.
5. The yellow/black striped wire is for the Neutral safety switch.
This is the key to the system. There are 11 outputs that are color-keyed to the switch panel, each with a fuse and the ability to directly power components that use 25 amps or less. The Powercell handles multiple electrical loads up to125 total amps continually. We mounted ours under the dash so it could power the Holley coil drivers, starter, the trigger for the Dominator, and the parking, head- and taillamps.
1. The black cable is from the Mastercell.
2. The colored wires power anything less than 25 amps. We used a relay for the electric fans, everything else we powered directly from the Powercell.
3. These are power wires that are connected to the battery through the Mega Fuse Kit included in the ISIS system.
When the system is powered up, each output has an LED that indicates a complete circuit and whether or not the output is turned on, making it idiot-proof. Just don't forget to install the correct fuses before you connect the outputs. Ask us how we know.
To run the Demon, we used a fraction of the system functions. Each Powercell adds another 10 outputs that can be used to handle up to 50 circuits using one Mastercell, including pulse width modulated circuits for fans or interior lighting. It also has numerous safety features like automatic shutoff after 125 degrees and if power is applied to a switch in the ON position. There is also a key fob to operate features remotely, and a circuit for flashers and blinkers that require only a momentary switch to operate. It's a light and simple system.
We killed the battery playing with the car and found out the hard way that the minimum system voltage is 8 volts. Below that, the ISIS system will not activate. It clicks like a bad starter, so don't be fooled.
Elk Grove Village
Alston Race Cars