What wire at the Jeep ignition switch connector carries the start signal?

Cavity 1, a yellow (YL) wire on both XJ and ZJ, is the ignition switch output (START).

Which pin on the ignition switch 7-way connector is the fused B(+) power feed?

The fused B(+) feed is a red (RD) wire on XJ and red/white (RD/WT) on ZJ, listed in the table (cavity 4, with a second fused B(+) row at the bottom of the table).

What circuit is the GY/WT (XJ) or GY/BK (ZJ) wire at the ignition switch?

It is the red brake warning lamp driver circuit (cavity 3).

Does this pinout apply to both Cherokee (XJ) and Grand Cherokee (ZJ)?

Yes — the color column is split into XJ and ZJ, giving the wire colors for both platforms at each connector cavity.

Which cavities provide ignition switch output in RUN and ACC/RUN?

The table lists an ignition switch output (RUN) circuit (WT wire on XJ) and an ignition switch output (ACC/RUN) circuit (BK/RD wire on XJ) on the lower cavities of the connector.

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Jeep XJ Cherokee / ZJ Ignition Switch 7-Way Connector Pinout & Wire Colors

Ignition switch 7-way connector pinout with CAV, wire-color, and circuit-function table

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Wiring diagram of an ignition switch 7-way connector with a CAV/color/function table listing start, run, and accessory circuits.

AI caption December 2024 · Photo 45 of 91

This document is a pinout reference for the ignition switch 7-way connector, apparently from a Jeep service manual covering both XJ (Cherokee) and ZJ (Grand Cherokee) platforms, as the wire color table has separate XJ and ZJ color columns. The upper portion shows a line drawing of the 7-way connector with callouts identifying cavity positions 1 and 7. Below the drawing is a table listing each cavity (CAV), its wire color for XJ and ZJ vehicles, and its circuit function. Functions identified include ignition switch output (START) on a yellow (YL) wire, ignition switch output (RUN/START), a red brake warning lamp driver circuit (GY/WT on XJ, GY/BK on ZJ), fused B(+) feeds (RD on XJ, RD/WT on ZJ), ignition switch output (RUN), and ignition switch output (ACC/RUN). A reader can use this chart to identify which wire at the ignition switch connector carries battery power, start signal, run/accessory feeds, and the brake warning lamp circuit — useful for diagnosing no-start or no-crank conditions, ignition switch replacement, or wiring repairs. Some wire colors and cavity numbers in the lower rows of the table are difficult to read due to scan quality.

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Frequently asked questions

What wire at the Jeep ignition switch connector carries the start signal?: Cavity 1, a yellow (YL) wire on both XJ and ZJ, is the ignition switch output (START).
Which pin on the ignition switch 7-way connector is the fused B(+) power feed?: The fused B(+) feed is a red (RD) wire on XJ and red/white (RD/WT) on ZJ, listed in the table (cavity 4, with a second fused B(+) row at the bottom of the table).
What circuit is the GY/WT (XJ) or GY/BK (ZJ) wire at the ignition switch?: It is the red brake warning lamp driver circuit (cavity 3).
Does this pinout apply to both Cherokee (XJ) and Grand Cherokee (ZJ)?: Yes — the color column is split into XJ and ZJ, giving the wire colors for both platforms at each connector cavity.
Which cavities provide ignition switch output in RUN and ACC/RUN?: The table lists an ignition switch output (RUN) circuit (WT wire on XJ) and an ignition switch output (ACC/RUN) circuit (BK/RD wire on XJ) on the lower cavities of the connector.