The difference between a 4 and 5 pin relay is that a 4 pin relay is used to control a single circuit whereas a 5 pin relay switches power between two circuits.
4 pin 30 amp 12 volt relay wiring diagram.
There are 2 types of 4 pin relay available.
4 pin relay 4 pin relays use 2 pins 85 86 to control the coil and 2 pins 30 87 which switch power on a single circuit.
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These layouts are shown on the two 5 pin relays below pin 87a not present on 4 pin relays.
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The type b layout is arguably easier to work with as the connected terminals are in line making the wiring easier to visualise.
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You will notice that on the type b layout pins 86 and 30 are swapped over compared with the type a layout.
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This 4 pin relay comes with no labeling or wiring diagram.
Using a 30 amp spdt relay connect terminal 87 to constant 12 volts positive with a fuse rated to the sum of the additional accessories youve added and the components you need.