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1995 Ford Diesel High Idle Wiring Diagram - DIY Relay Mod (TPS/IVS)
Reference · 1992-1997 C-350 (Centurion Conversions)All 7 wiring diagrams
Hand-drawn wiring diagram showing a RadioShack DPDT relay, brake interlock, TPS feed and 1k-ohm resistor for a diesel high-idle control.
Part of 1992-1997 Ford C-350 (Centurion Conversions) Wiring Diagrams
This is a hand-drawn wiring diagram for adding a high-idle control circuit to a 1995 diesel (labeled "High Idle on White '95 Diesel"). The circuit uses two RadioShack components: a SPDT switch/relay (part 275-248) used as a brake interlock, and a DPDT relay (part 275-218) used as the idle control relay. A switched +12V "High Idle on/off" feed passes through the brake-interlock relay, which is controlled by the brake light switch (+12V when the pedal is pressed), so pressing the brake disables the high idle. The DPDT relay's pins are numbered 1-8: pin 7 receives the switched power, pin 8 goes to ground, pin 5 takes the red/orange wire from the harness to the IVS (idle validation switch), pin 6 takes the brown/white wire from the harness to the TPS, pin 3 is spliced into the brown wire on the IVS, pin 1 connects to red/orange on the IVS, and pin 2 splices to brown/white on the TPS. Pin 4 routes through a 1k ohm resistor to an "Idle speed control" potentiometer, whose wiper connects to the grey/white wire on the TPS, allowing adjustable high-idle RPM. One switch terminal and one pot terminal are marked "Not used."
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Frequently asked questions
- What parts are needed for this high idle modification?
- The diagram calls for a RadioShack SPDT device (part 275-248), a RadioShack DPDT relay (part 275-218), a 1k ohm resistor, and an idle speed control potentiometer.
- How does the brake interlock work in this circuit?
- The switched +12V high idle feed passes through a brake interlock relay controlled by the brake light switch (+12V when the pedal is pressed), so the high idle circuit is interrupted when the brake pedal is pressed.
- Which TPS and IVS wires are tapped for this high idle circuit?
- The red/orange wire from the harness to the IVS, the brown wire on the IVS, the brown/white wire from the harness to the TPS (spliced at brown/white on TPS), and the grey/white wire on the TPS which connects to the idle speed control potentiometer.
- How is the idle speed adjusted in this circuit?
- Relay pin 4 feeds through a 1k ohm resistor into an idle speed control potentiometer, whose output goes to the grey/white wire on the TPS, allowing the high idle speed to be adjusted.
- What vehicle is this diagram for?
- The diagram is labeled "High Idle on White '95 Diesel," indicating a 1995 diesel vehicle.
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