There is no permission for this. This is a modification. Under normal circumstances, the traffic police will not punish this. If a large car is stopped, you will definitely be fined for some reason or pay a toll. Everyone knows it, just like every semiconductor is the same thing as drunk driving. We install almost all of them here, and I make watering accessories.
No. The car watering solenoid valve will be equipped with a guide diode. If the car watering solenoid valve is connected in reverse, it will stop working. It will have no impact on the switching power supply and is unlikely to cause any damage. The automotive sprinkler solenoid valve can work with the sprinkler accessory head for automotive water spray operations and is often used to cut off the flow of oil, water, gas and other substances.