Which Bronco II connectors are covered in this 2.9 to 4.0 wiring cross-reference?

Bronco II headlight harness (HH) Plugs 122, 117, 136, 116, 138, and 101, mapped to 4.0L Plugs 117, 119, 116, and 101, plus Explorer mate plugs 117 and 116 for comparison.

What wire must be grounded to engage 4-low according to this document?

On BII Plug 116 pin 8, wire 463 r/w 'needs to be grounded to go into 4low.'

How does 4.0 Plug 116 pin 1 differ between manual and automatic transmissions?

Pin 1 uses 32 r/lb for manual (starter control) and 329 pk for automatic.

Which wire goes to the in-tank fuel pump?

Wire 787 pk/bk goes to pin 2 on the in-tank fuel pump (BII Plug 101 pin 4 and 4.0 Plug 101 pin 3).

What does BII Plug 138 connect to?

The document states BII Plug 138 HH (male, with pins 1 lb/bk and 2 lb) 'goes to nothing.'

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Ford Bronco II 2.9 to 4.0 Engine Swap Wiring Connector Pinout Cross-Reference

Ford Explorer harness connector pin-out notes plug 117 119 122 wire colors VSS fuel pump

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Handwritten harness connector pinout reference mapping plug pins to wire colors/circuits for VSS, fuel pump, tach, self-test, and neutral-sensing on a Ford Explorer swap.

AI caption February 2012 · Photo 34 of 45

This document is a hand-compiled wiring cross-reference for swapping a Ford 4.0L engine harness into a Bronco II originally equipped with a 2.9L engine (per the filename, 2.9-to-4.0 wiring). It lists pin-by-pin details for the Bronco II headlight harness (HH) connectors — Plugs 122, 117, 136, 116, 138, and 101 — including each pin's circuit number, wire color code (e.g., 332 white, 11 dg/y tach, 200 w/bk, 361 r, 658 pk/lg check engine light, 787 pk/bk fuel pump), and functional notes such as connections to the computer, starter relay, TFI, neutral sensing switch (NSS), A4LD shift, clutch switch, RABS, and VSS. On the right side, the corresponding 4.0L connectors (Plugs 117, 119, 116, 101) are listed the same way, with drawn arrows mapping which Bronco II wire connects to which 4.0L pin. Notes distinguish manual vs. automatic transmission wiring (e.g., 32 r/lb for manual vs. 329 pk for auto) and identify wires that "don't matter." A footnote section lists the mate plugs on the Explorer harness (Plugs 117 and 116) for comparison. A short legend defines Pk = pink and P = purple.

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Frequently asked questions

Which Bronco II connectors are covered in this 2.9 to 4.0 wiring cross-reference?: Bronco II headlight harness (HH) Plugs 122, 117, 136, 116, 138, and 101, mapped to 4.0L Plugs 117, 119, 116, and 101, plus Explorer mate plugs 117 and 116 for comparison.
What wire must be grounded to engage 4-low according to this document?: On BII Plug 116 pin 8, wire 463 r/w 'needs to be grounded to go into 4low.'
How does 4.0 Plug 116 pin 1 differ between manual and automatic transmissions?: Pin 1 uses 32 r/lb for manual (starter control) and 329 pk for automatic.
Which wire goes to the in-tank fuel pump?: Wire 787 pk/bk goes to pin 2 on the in-tank fuel pump (BII Plug 101 pin 4 and 4.0 Plug 101 pin 3).
What does BII Plug 138 connect to?: The document states BII Plug 138 HH (male, with pins 1 lb/bk and 2 lb) 'goes to nothing.'