Here's a quick follow up post to our video showing you how to wire you ignition switch into our ISIS Intelligent Multiplex System.
A common question that we get is: "How do I wire inputs so that my turn-signals only work when the ignition is on?". This is a really good question and certainly an important one. There are lots of things in the car that you want to only work when the ignition is on. The turn-signals are a great example but other could include the back-up lights, fans, audio and others.
The way the switches wire into ISIS makes doing this really easy.
Remember that the inputs to the MASTERCELL work by being connected to ground. You wire one side of your switch to the MASTERCELL input wire and the other connects to ground. If you put something in series to interrupt that path to ground, the MASTERCELL will not see the input. So, the easiest way to get ignition only functions is to use the ignition switch to interrupt the path to ground for the switched function.
For example, we have three wires on our turn signal switch. One each for the left and right turn-signal inputs and one for ground. If we connect the ground wire from the turn-signal switch to the IGN terminal on the ignition switch, there will only be a path to ground for the turn-signals when the key is in the ignition position. When the ignition is off, the turn-signals will not turn on.
See the diagram on page 25 of the 3-Cell Kit Manual for a schematic for this.
Check out our follow up video talking about this.
You can catch the whole video install series on our website by clicking here.
Stay tuned for more!
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I understand what you are doing here, but would it not be easier to program the Mastercell to only make the outputs on the Powercell active once it has an active input on the Ignition switch.
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