CarFirst: Sell Used Cars, Online Price Valuation in Pakistan. SehgalMotors.PK | Buy Car Accessories online in Pakistan | Car Auto Parts Online. Official Website of Motor Transport Management Information System. PkMotors.com: Buy used cars, sell used cars online in Pakistan. Cars website. Wiring a Relay for Accessories. This document describes how to wire a relay into a motorcycle's 12 volt electrical system in order to power add-on accessories such as radar detectors, GPS'es, satellite radio, heated clothing, aux lights, etc.
There's also some photos of an install on the author's R1200GS. Why use a relay? There are several reasons you should use a relay instead of just wiring your accessories directly to the battery. The most important reason is so that your accessories won't be ON all the time. What is a relay? In simplest terms, it's a little switch that throws a bigger switch. Here's a photo of a typical relay. Relays generally have 4 connectors (if they have 5, you'll ignore one of them). Note that this relay has slightly larger connectors for the main power side (numbered 3 & 5), and smaller connectors for the side that taps into switched power (numbered 1 & 2). The big rectangle with the diagonal line represents a solenoid which is what turns the power "ON". Wiring in the relay.
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