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The top pin is 87, which connects to the electrical load like the 12-volt positive lead for the fan. The 86 pin is connected to switched ignition. The 30 pin goes to direct battery positive (through a fusible link, of course). The 85 pin is ground. The center pin 87a is rarely used. Note the relays wire the same way, but the import piece is not marked as the Bosch is.