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Two relays are supplied and can be mounted near the evaporator; the heater control valve relay and A/C compressor relay. The heater control valve relay is wired to one side of the heater control valve by a green wire while the other side connects to the 30AMP circuit breaker up near the battery. The 30AMP circuit breaker is connected directly to 12V. The white wire running from the heater control valve goes to chassis ground.