Where does the red wire connect on the fog light harness?

The red wire connects to the green wire at Pin #3 of the connector (callout A).

Where does the blue wire connect?

The blue wire connects to the thin blue wire at Pin #4 (callout B).

Where does the black wire go?

The black wire connects to ground, shown at a chassis bolt location (callout C).

Does this diagram apply if my truck has a factory alarm?

No — the caption states this is the 'Diagram without Factory Alarm'; the harness connects to the switch.

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Toyota Tundra Fog Light Harness Wiring - Pin 3/4 Connections, No Alarm (Fig 10)

Annotated install photo showing fog-light wire connection steps over a harness

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Photo-based installation instruction showing labeled steps to connect red, blue, and black fog-light wires to the vehicle harness.

AI caption January 2015 · Photo 21 of 21

This document is an annotated installation photograph (labeled 'Figure 10 - No Alarm') from TundraPart.com showing how to connect a pre-wired plug-and-play fog light harness inside a Toyota Tundra dash/kick-panel area. The photo shows the vehicle's interior wiring harness and connector block with three lettered callouts: (A) connect the harness's Red wire to the Green wire at connector Pin #3; (B) connect the Blue wire to the thin Blue wire at Pin #4; and (C) connect the Black wire to a ground point, shown at a chassis bolt. A prominent warning instructs the installer to double-check that the Red and Blue wires are installed properly before re-connecting the battery. Captions note this diagram applies to vehicles WITHOUT a factory alarm, and that the harness connects to the switch. Connector pin positions 1 through 4 are marked on the photo. The image carries a 'DASZ' watermark and TundraPart.com branding. Readers can learn the exact wire-to-wire and pin assignments needed to complete step 11 of a Tundra fog light installation on a non-alarm-equipped truck, plus the ground location and the battery reconnection precaution.

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Frequently asked questions

Where does the red wire connect on the fog light harness?: The red wire connects to the green wire at Pin #3 of the connector (callout A).
Where does the blue wire connect?: The blue wire connects to the thin blue wire at Pin #4 (callout B).
Where does the black wire go?: The black wire connects to ground, shown at a chassis bolt location (callout C).
Does this diagram apply if my truck has a factory alarm?: No — the caption states this is the 'Diagram without Factory Alarm'; the harness connects to the switch.
What should I check before reconnecting the battery?: Double-check that the red and blue wires are installed properly before re-connecting the battery.