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There are several relay panels in newer vehicles. A typical use of a relay panel is to aggregate several control relays into a single convenient location. Relays are used to provide control of high current devices with a small control current. So by activating a switch in the cabin a relay is energized to start the airconditioning. If there were no relays then heavy wire would have to be run to heavy switches to control high current systems resulting in higher costs and added vehicle weight.

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16y ago

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