5-Pin Automotive Relay Pinout Diagram - Terminals 30, 85, 86, 87, 87a
Reference · 1987-1991 BroncoAll 111 schematics
Relay schematic showing numbered socket terminals and the internal coil and switching contacts mapped to pins 30, 85, 86, 87 and 87a.
Part of 1987-1991 Ford Bronco Schematics
This document is a schematic illustration of a standard 5-pin automotive relay, uploaded as part of a multi-image relay reference set for a 1990 Ford Bronco. The left portion shows the physical footprint of the relay base with five terminals: pins 1, 2, and 3 arranged in a top row (pin 3 being a wider blade) and pins 4 and 5 in a bottom row. The right portion shows the internal electrical schematic and cross-references each physical pin number to its standard DIN relay terminal designation: pin 1 = terminal 85, pin 2 = terminal 86, pin 3 = terminal 30, pin 4 = terminal 87a, and pin 5 = terminal 87. The schematic depicts the electromagnet coil connected between terminals 85 and 86, and a movable switch contact on terminal 30 shown at rest against terminal 87a (the normally-closed contact), with terminal 87 as the normally-open contact. A reader can learn how to identify relay terminals by pin position and understand the internal switching arrangement of a common SPDT automotive relay. No year, make, model, or part numbers appear in the image itself.
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Frequently asked questions
- Which pin is terminal 30 on this 5-pin relay?
- Terminal 30 corresponds to pin 3, the wider blade in the top row of the relay base.
- Which terminals connect to the relay coil?
- The coil is drawn between terminal 85 (pin 1) and terminal 86 (pin 2).
- What are terminals 87 and 87a on this diagram?
- Terminal 87 is pin 5 and terminal 87a is pin 4. The switch arm from terminal 30 is shown resting toward 87a, indicating 87a is the contact connected when the relay is at rest.
- How are the five pins physically arranged on the relay base?
- Pins 1, 2, and 3 are in a top row (pin 3 is a wider blade), and pins 4 and 5 are vertical blades in a bottom row.
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