What year and model does this fuse block wiring diagram cover?

The diagram is labeled "Fig. 4: Fuse Block & Underdash — 1987 Ford LTD Crown Victoria."

What wire color feeds the ignition coil and ignition module?

The diagram shows BRN-PNK going to the ignition coil and RED-LT GRN going to the ignition module, with RED-LT GRN also feeding the TFI ignition module.

What circuits are fed by the WHT-PPL wires from the underdash junction block?

WHT-PPL wires feed the clock or Tripminder module, defogger switch, trunk release switch, right cornering light relay, instrument cluster pin #13, A/C function switch, illuminated entry timer, window safety relay (4 door), police power relay, and cruise control amplifier.

What does the back-up light switch control per this diagram?

Closed in "R", it feeds BLK-PNK to the back-up lights and PPL-ORG to the directional flasher. Closed in "P" or "N" (neutral/safety gear selector switch), RED-LT BLU goes to the ignition module and WHT-PNK to ignition switch pin ST.

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1987 Ford LTD Crown Victoria Fuse Block & Underdash Wiring Diagram

Fuse block and underdash wiring diagram for 1987 Ford LTD Crown Victoria

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Wiring diagram of the fuse block and underdash circuits for a 1987 Ford LTD Crown Victoria with color-coded wires.

AI caption April 2007 · Photo 1830 of 3944

This document is a scanned Mitchell Repair Information wiring diagram, labeled "Fig. 4: Fuse Block & Underdash" for the 1987 Ford LTD Crown Victoria. It shows the underdash electrical circuitry centered on the fuse block, including ignition switch terminal feeds (BATT, ACCY, START, RUN, OFF, LOCK), fusible links, and numbered fuse block positions (1–18, including circuit breakers at positions 2, 12, and 14). Wire color codes are given for every circuit (e.g., WHT-PNK, RED-LT GRN, GRY-YEL, BLK-ORG, WHT-PPL, PPL-ORG), and destinations are identified: ignition coil, TFI ignition module, warning buzzer, seat belt and key warning switches, park/dual brake warning switches, radio, clock or Tripminder, power windows, power door locks, power seats, tailgate power window/lock switches, hazard flasher, horn relay, fuel door release switch, trailer battery charging relay, level control module, defogger, trunk release, illuminated entry timer, police power relay, and cruise control amplifier. Both carbureted (CARB) and fuel-injected (EFI) variants are indicated. Footnotes state fuse #12 is a circuit breaker with power seats and/or door locks, and fuse #14 is a circuit breaker with 2-door power windows. A reader can trace wire colors and connection points for underdash fuse-fed circuits.

This document covers 1987, which may differ from this 1985 Ford LTD Crown Victoria.

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Frequently asked questions

What year and model does this fuse block wiring diagram cover?: The diagram is labeled "Fig. 4: Fuse Block & Underdash — 1987 Ford LTD Crown Victoria."
Which fuse positions are actually circuit breakers?: Per the note on the diagram, fuse #12 is a circuit breaker used with power seats and/or door locks, and fuse #14 is a circuit breaker used with 2-door power windows. Position 2 is also marked "CB."
What wire color feeds the ignition coil and ignition module?: The diagram shows BRN-PNK going to the ignition coil and RED-LT GRN going to the ignition module, with RED-LT GRN also feeding the TFI ignition module.
What circuits are fed by the WHT-PPL wires from the underdash junction block?: WHT-PPL wires feed the clock or Tripminder module, defogger switch, trunk release switch, right cornering light relay, instrument cluster pin #13, A/C function switch, illuminated entry timer, window safety relay (4 door), police power relay, and cruise control amplifier.
What does the back-up light switch control per this diagram?: Closed in "R", it feeds BLK-PNK to the back-up lights and PPL-ORG to the directional flasher. Closed in "P" or "N" (neutral/safety gear selector switch), RED-LT BLU goes to the ignition module and WHT-PNK to ignition switch pin ST.