28-12-12, 10:34 AM
A relay is just a switch, doesn't boost current at all. It lets you use a low current/voltage circuit to switch on a high current/voltage circuit.
For example, on a car the starter motor will have very thick cables running from it. You don't want to run those fat cables into the cabin up to the ignition switch, so you use a very low current circuit with small wires to energise a relay, which completes the circuit for the starter motor. Or you could use a 12v DC circuit to energise a relay and switch in a 240v AC circuit. It's just an electrically triggered switch.
It might be better in this situation as you're running lots of stuff (including heaters) off one connector in the fuse box. You could use this existing connection to energise a relay which will switch on a secondary circuit running the GPS, grips etc.
For example, on a car the starter motor will have very thick cables running from it. You don't want to run those fat cables into the cabin up to the ignition switch, so you use a very low current circuit with small wires to energise a relay, which completes the circuit for the starter motor. Or you could use a 12v DC circuit to energise a relay and switch in a 240v AC circuit. It's just an electrically triggered switch.
It might be better in this situation as you're running lots of stuff (including heaters) off one connector in the fuse box. You could use this existing connection to energise a relay which will switch on a secondary circuit running the GPS, grips etc.