Constant to Momentary Output

Momentary to Constant Output

Stereo to Bridged Mono Switched Outputs

Basic Remote Start Relay Diagram

One Channel to Multiple Outputs

Constant to Momentary Output
The capacitor allows the coil of the relay to be energized until the capacitor stores a charge, thus de-energizing the coil. The resistor bleeds off the charge of the capacitor when positive voltage is removed from the other side of the coil. You can increase the output time by simply changing the value of the capacitor. This one will give you about a 1/2 second output..
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Momentary to Constant Output
Once activated by the relay on the left, the relay's coil on the right will stay energized until either ground or 12v(+) is removed. You can do this with another relay. Or try connecting to a 12v(+) switched source instead of a constant one. Or you can have a door trigger activate a relay to break continuity. The variations are practically endless.
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Stereo to Bridged Mono Switched Outputs
If your amplifier is capable of running in dual mode or mono, and is configured to run mono by using the left channel positive and the right channel negative outputs, then the diagram to switch between stereo and mono to the same pair of speakers (mostly woofers) is as shown below. Remember this will decrease the impedance by 1/2 and in theory double the power output of the amplifier. Be sure to check the specifications of your amplifier first.

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One Channel to Multiple Outputs
You can add multiple functions to an AUX ouput of an alarm or keyless entry by adding a relay in series with the output lead as shown to any switch or accessory with an output. Only one ouput can be active at anytime, the one first in the chain (bottom relay in diagram) will have priority, so if you wanted to have the ignition from the key to have priority over the ignition from the remote start, you would connect it to the first relay and the output of the remote start to the next and so on. Also pay attention to the top relay shown. Terminal #87a (the default output) will be active only when none of the coils of the relays are energized. There are many other accessories that can be used with this, including the remote turn on lead and/or power antenna lead of your head unit.

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Basic Remote Start Relay Diagram
The consequences should be obvious. Below is a basic relay remote start system. It is not shown with any inhibits, nor a single trigger to activate and deactivate it, and does not have "rev protection". You are much better off with a system you can purchase from a local dealer or retailer. They include many important safety features and come with a warranty, unlike the one below. But if you must make one from relays, here are the basics (shown below without the diodes across the coils). You will have to customize this to work with the vehicle you plan to install it into. Make note of each wire's function in the harness connected to the back of the ignition switch. You will have to duplicate these in order to have a successful installation. Only advanced installers should attempt this. I have made several of these and they are still on the road today. I included timers and inhibits in them to perform the same as a manufacture's piece. But I still prefer to use theirs. It takes less time to install from start to finish and theirs is a whole lot smaller.
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