1985 Ford Bronco Ignition & Starter Relay Wiring Diagram - Battery to Ignition
Reference · 1980-1986 BroncoAll 92 wiring diagrams
User-drawn wiring diagram showing start relay and ignition relay connections: battery to start relay (12V start-only source) and ignition relay (12V key-on source) feeding starter and ignition.
Part of 1980-1986 Ford Bronco Wiring Diagrams
This is a simple hand-drawn (computer-drafted) wiring diagram, uploaded as "Ignition Diagram.jpg" for a 1985 Ford Bronco, showing a two-relay starting and ignition circuit. It depicts a BATTERY with its negative terminal grounded and its positive terminal feeding a START RELAY. The start relay has an 'S' (signal) terminal fed by a "12v Start Only Source" and an 'I' terminal; its output feeds the STARTER. A second relay, labeled IGN. RELAY, has an 'S' terminal fed by a "12v Key on Source" and a 'G' terminal wired to chassis ground via a black wire. The ignition relay's power side ties into the battery/start relay feed and its output goes to a box labeled IGNITION. The diagram uses red lines for power wiring and black lines for grounds. No wire gauges, colors codes, part numbers, fuse ratings, or year/model applicability are stated in the drawing itself. A reader can learn the basic relay-based hookup scheme for powering an ignition system from a key-on source and cranking the starter from a start-only source, typical of Ford-style external starter relay wiring.
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Frequently asked questions
- What feeds the 'S' terminal on the start relay in this diagram?
- A '12v Start Only Source' feeds the S terminal of the START RELAY.
- How is the ignition relay triggered in this diagram?
- The IGN. RELAY 'S' terminal is fed by a '12v Key on Source', and its 'G' terminal is wired to chassis ground with a black wire.
- Where does the starter get its power in this diagram?
- The STARTER is fed from the output side of the START RELAY, which receives power from the battery positive terminal.
- How is the battery connected in this diagram?
- The battery negative (-) terminal goes to chassis ground and the positive (+) terminal feeds the START RELAY power terminal, which also ties into the ignition relay circuit.
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