What are connectors C250 and C251 on a 1990 Ford Bronco?

They are the two 14-pin instrument cluster connectors (gasoline engine). C250 handles indicators like seat belt, high beam, tachometer, 4x4, low range, fuel level, and power supply; C251 handles oil pressure, left turn, brake warning, Check Engine input from EEC, temperature, engine warning, and the amp indicator circuits.

Which pin on C250 is the tachometer input?

Pin 6, circuit 11 (DG/Y — dark green/yellow) is the tachometer input; pin 7, circuit 398 (BK/Y) is the tachometer ground.

What wire feeds power to the instrument cluster in RUN and START?

Circuit 640 (R/Y — red/yellow): pin 13 on connector C250 and pin 5 on connector C251, labeled 'Power Supply in RUN and START.'

Which pin carries the Check Engine light signal from the EEC?

C251 pin 9, circuit 658 (PK/LG — pink/light green), 'Check Engine' Input From EEC.

Where is the 4x4 indicator input on the cluster connector?

C250 pin 10, circuit 210 (LB — light blue), 4x4 Indicator Input. The Low Range input is pin 11, circuit 782 (BR/W, Bronco only) / 784 (LB/BK).

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1990 Ford Bronco Instrument Cluster Connector Pinout C250 & C251 (150-12)

Ford instrument cluster connector face and pinout chart C250 C251 gasoline 150-12

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Connector face/pinout chart (page 150-12) for the Ford instrument cluster connectors C250 and C251, listing pin numbers, circuit IDs, wire colors and functions for gasoline applications.

AI caption February 2015 · Photo 1713 of 1799

This document is page 150-12, "Connector Faces/Pinout Charts," from a Ford factory electrical/vacuum troubleshooting manual, showing the two instrument cluster connectors (C250 and C251) for gasoline-engine vehicles. Each connector is drawn as a 14-pin connector face with pins numbered 1–7 on the bottom row and 8–14 on the top row, with each pin labeled by circuit number and wire color code. Accompanying tables list every pin, its circuit number/wire color, and function. C250 carries inputs for the fasten seat belts indicator (450 DG/LG), high beam indicator (932 GY/W), ground (57 BK), instrument panel illumination (19 LB/R), tachometer input and ground (11 DG/Y, 398 BK/Y), right turn (2 W/LB), anti-lock brakes warning (603 DG), 4x4 indicator (210 LB), low range input (782 BR/W Bronco only / 784 LB/BK), fuel level (29 Y/W), and power supply in RUN and START (640 R/Y). C251 covers oil pressure, ground, left turn, power supply, brake warning, "Check Engine" input from EEC, temperature, "Engine Warning" input, and the ammeter/"Amp Indicator" output and input circuits. This page is useful for diagnosing gauge, warning-light, or cluster wiring problems on the Ford Bronco and related trucks.

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Frequently asked questions

What are connectors C250 and C251 on a 1990 Ford Bronco?: They are the two 14-pin instrument cluster connectors (gasoline engine). C250 handles indicators like seat belt, high beam, tachometer, 4x4, low range, fuel level, and power supply; C251 handles oil pressure, left turn, brake warning, Check Engine input from EEC, temperature, engine warning, and the amp indicator circuits.
Which pin on C250 is the tachometer input?: Pin 6, circuit 11 (DG/Y — dark green/yellow) is the tachometer input; pin 7, circuit 398 (BK/Y) is the tachometer ground.
What wire feeds power to the instrument cluster in RUN and START?: Circuit 640 (R/Y — red/yellow): pin 13 on connector C250 and pin 5 on connector C251, labeled 'Power Supply in RUN and START.'
Which pin carries the Check Engine light signal from the EEC?: C251 pin 9, circuit 658 (PK/LG — pink/light green), 'Check Engine' Input From EEC.
Where is the 4x4 indicator input on the cluster connector?: C250 pin 10, circuit 210 (LB — light blue), 4x4 Indicator Input. The Low Range input is pin 11, circuit 782 (BR/W, Bronco only) / 784 (LB/BK).