What fuse powers the horn and cigar lighter circuit?

Fuse position 16, a 30A fuse in the fuse panel (see pages 12-3, 12-5), which is hot at all times.

What wire color feeds the horn relay and cigar lighter?

Circuit 460 Y/LB (yellow/light blue) runs from the fuse panel through splice S229 and connector C204 to the cigar lighter and horn relay.

What is different on trucks without speed control?

Without speed control, a horn relay jumper is used instead of the horn relay, and the horn switch connects directly through the slip ring rather than being part of the speed control switch.

What wire goes to the horns themselves?

Circuit 6 Y/LG (yellow/light green) runs from the horn relay through C202 and splice S148 to the left horn (low pitch) and right horn (high pitch).

What resistor values are in the speed control switch?

680 ohms (SET ACCEL), 120 ohms (COAST), and 2,200 ohms (RESUME).

Home/ Registry/ Ford/ Bronco/ 1987-1991/ “Eddie Bauer”/ Photo supermotors.net/registry/media/860255

1990 Ford Bronco Horn & Cigar Lighter Wiring Diagram 44-1 (With/Without Cruise)

Horn and cigar lighter wiring diagram with and without speed control showing color-coded circuits and relays

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Horn/cigar lighter wiring diagram (44-1) showing with and without speed control circuits, fuse panel feeds, relays, and grounds.

AI caption April 2011 · Photo 673 of 1799

This is page 44-1, "Horn/Cigar Lighter," from a Ford wiring diagram manual, uploaded as applying to a 1990 Ford Bronco. It shows two side-by-side wiring schematics: one for vehicles WITH speed control and one WITHOUT speed control. Both circuits are fed from fuse position 16 (30A, hot at all times) in the fuse panel (referenced to pages 12-3 and 12-5) via circuit 460 Y/LB through splice S229 and connector C204 to the cigar lighter and to the horn relay (or horn relay jumper on non-speed-control trucks). The horn control path uses circuit 151 LB/BK through splice S226 and connector C219 to the slip ring and horn switch. On speed-control vehicles the horn switch is integrated into the speed control switch assembly (ON/OFF/SET ACCEL/COAST/RESUME with 680, 120, and 2,200 ohm resistors), grounding at G204. Relay output circuit 6 Y/LG passes through C202 and splice S148 to the left horn (low pitch) and right horn (high pitch). Cigar lighter ground is circuit 57 BK to G201, with a note referencing instrument illumination on page 71-1. Ground references are on pages 10-11 and 10-12; speed control detail is on page 31-1.

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Frequently asked questions

What fuse powers the horn and cigar lighter circuit?: Fuse position 16, a 30A fuse in the fuse panel (see pages 12-3, 12-5), which is hot at all times.
What wire color feeds the horn relay and cigar lighter?: Circuit 460 Y/LB (yellow/light blue) runs from the fuse panel through splice S229 and connector C204 to the cigar lighter and horn relay.
What is different on trucks without speed control?: Without speed control, a horn relay jumper is used instead of the horn relay, and the horn switch connects directly through the slip ring rather than being part of the speed control switch.
What wire goes to the horns themselves?: Circuit 6 Y/LG (yellow/light green) runs from the horn relay through C202 and splice S148 to the left horn (low pitch) and right horn (high pitch).
What resistor values are in the speed control switch?: 680 ohms (SET ACCEL), 120 ohms (COAST), and 2,200 ohms (RESUME).