What fuse powers the diesel warning lights circuit?

Fuse panel position 17, a 10A fuse that is hot in START or RUN, feeding circuit 640 (R/Y wire).

When does the Fuel Water Switch close?

The Fuel Water Switch closes when there is water in the fuel sediment bowl, illuminating the Water-In-Fuel indicator. The diagram shows different arrangements for '92 versus '93-96/7.

What wire connects the Wait-To-Start indicator to the Glow Plug Controller?

Circuit 464, a BK/PK (black/pink) wire, running to the Glow Plug Controller with ground point G1002.

When does the Plugged Fuel Filter Switch close?

It closes when the fuel filter is plugged, grounding circuit 42 (R/W) through the LB/R wire and G1015 to light the Plugged Fuel Filter indicator.

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Ford Diesel Warning Lights Wiring Diagram 1992-1997 - Wait-to-Start, WIF Lamp

Diesel Warning Lights wiring diagram with fuse panel, color-coded wires, switches and indicator lamps

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'92-96/7 Diesel Warning Lights
IF THE IMAGE IS TOO SMALL, click it.

When the Ignition Switch is in START or RUN, the Warning Indicators are powered through Fuse 17.

The Plugged Fuel Filter Indicator illuminates when fuel pressure in the engine exceeds operational limits.

The Wait-to-Start Indicator illuminates for 1 to 15 seconds (IDI Diesel) or 1-90 seconds (DI PowerStroke Diesel) after the Ignition Switch is placed in the START or RUN position, indicating that the diesel engine is not ready to be started.

The Water-In-Fuel Indicator illuminates when the Ignition Switch is in START or RUN and the Fuel Water Switch senses water in the fuel/water separator sediment bowl.

When water is detected in the fuel/water separator sediment bowl, the bowl must be drained to prevent damage to the fuel injectors. Refer to the Service Manual for draining instructions.

The Engine Warning Indicator illuminates with the Ignition Switch in START as a bulb test and when there is a high coolant temperature condition.

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Owner caption September 2025 · Photo 180 of 196

This is a wiring diagram titled "Diesel Warning Lights" covering the instrument-cluster warning lamp circuits for a Ford diesel truck. It shows power originating from fuse panel position 17 (10A, hot in start or run) feeding circuit 640 (R/Y) through splice S215 and connector G138 to circuit 53 (R/Y). A solid-state module works with the Fuel Water Switch (closed with water in the fuel sediment bowl), with separate variants noted for '92 and '93-96/7 model years, including a Water-In-Fuel Sensor ('93-96/7) grounded at G1056. The Diesel Warning Lamps Display contains four indicators: Wait-To-Start, Engine Warning, Plugged Fuel Filter, and Water-In-Fuel. The Wait-To-Start lamp connects via circuit 464 (BK/PK) to the Glow Plug Controller (G1002); the Engine Warning lamp via circuit 737 (W/LB) to the Overheat Warning Switch (G1014); the Plugged Fuel Filter lamp via circuit 42 (R/W) and LB/R wire to the Plugged Fuel Filter Switch (G1015), which closes when the filter is plugged; and grounds route through circuit 57 (BK), splice S202, to G201. The ignition switch (START/RUN/ACC/OFF/LOCK) ties in via circuit 41 (BK/LB) at connector G269. Readers can identify wire colors, circuit numbers, connectors, splices, and switch functions for diagnosing diesel warning lamp faults.

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Frequently asked questions

What fuse powers the diesel warning lights circuit?: Fuse panel position 17, a 10A fuse that is hot in START or RUN, feeding circuit 640 (R/Y wire).
What warning indicators are in the Diesel Warning Lamps Display?: Four indicators: Wait-To-Start, Engine Warning, Plugged Fuel Filter, and Water-In-Fuel.
When does the Fuel Water Switch close?: The Fuel Water Switch closes when there is water in the fuel sediment bowl, illuminating the Water-In-Fuel indicator. The diagram shows different arrangements for '92 versus '93-96/7.
What wire connects the Wait-To-Start indicator to the Glow Plug Controller?: Circuit 464, a BK/PK (black/pink) wire, running to the Glow Plug Controller with ground point G1002.
When does the Plugged Fuel Filter Switch close?: It closes when the fuel filter is plugged, grounding circuit 42 (R/W) through the LB/R wire and G1015 to light the Plugged Fuel Filter indicator.