How to change polarity from a negative, into a positive. Most aftermarket alarms and remote starter boxes use negative outputs to control things such as door locks, trunk release, dome lights, etc, but most of these items are positively switched..... how can you use a negative output to control these accessories? With a relay. We use the negative output to turn on/off a relay, and the relay passes the positive through to the load.

These are standard automotive style relays that can be found just about anywhere that sells automotive supplies.  

Automotive style relays WITH socket and short wire harness
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WATERPROOF automotive style relays with socket and short wire harness
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