What size are the fuse links in this power distribution diagram?

Fuse links J, A, and B are each 12-gauge (12 GA) gray fuse links.

What fuse feeds the trailer battery charge relay?

A 50A fuse in position Q of the engine compartment fuse box, present only with the trailer tow option, feeds circuit 37 Y to the trailer battery charge relay (page 95-1) in the trailer relay box.

What wire colors and circuits feed the Integral Alternator Regulator (IAR)?

Circuit 38 BK/O (black/orange) and circuit 36 Y/W (yellow/white) run through connectors C153 and C154 to the IAR B+ and A terminals; the IAR detail is on page 12-1.

Which connector is excluded on the Bronco?

Connector C105 in the 37 Y circuit is footnoted '* ALL EXCEPT BRONCO'.

Where do the battery grounds attach?

Battery negative (BK) runs to G103 (engine ground) and G101 (body ground); ground details are on page 10-3.

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Ford Power Distribution Wiring Diagram - Gasoline, Fuse Links, IAR, Trailer Tow

Ford EVTM page 13-1: power distribution wiring diagram with battery, fuse links and alternator

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Power distribution wiring diagram showing the battery, starter relay, fuse links and integral alternator regulator circuits.

AI caption July 2017 · Photo 297 of 386

This is page 94, section 13-1 ("Power Distribution, Gasoline") of a Ford factory-style wiring diagram set, showing the gasoline-engine power distribution circuit. The diagram traces battery power through fuse links J, A, and B (each 12-gauge, gray). Fuse link J feeds the Integral Alternator Regulator (IAR, page 12-1) via circuits 38 BK/O and 36 Y/W through connectors C153 and C154; a callout notes part of this wiring applies to 4.9L and 7.5L engines only. Fuse links A and B feed circuit 37 Y into the engine compartment fuse box, through a 50A fuse (position Q) labeled "with trailer tow only," then through connector C105 (footnoted "all except Bronco") to the trailer battery charge relay in the trailer relay box (page 95-1). The battery positive (R circuit) also feeds the starter relay (page 20-2) and starter solenoid (page 20-2). Battery negative (BK) runs to grounds G103 (engine) and G101 (body), with grounds detailed on page 10-3. The page teaches how battery power is distributed to charging, starting, and trailer-tow circuits, including wire gauges, circuit numbers, wire colors, connector IDs, and ground locations.

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Frequently asked questions

What size are the fuse links in this power distribution diagram?: Fuse links J, A, and B are each 12-gauge (12 GA) gray fuse links.
What fuse feeds the trailer battery charge relay?: A 50A fuse in position Q of the engine compartment fuse box, present only with the trailer tow option, feeds circuit 37 Y to the trailer battery charge relay (page 95-1) in the trailer relay box.
What wire colors and circuits feed the Integral Alternator Regulator (IAR)?: Circuit 38 BK/O (black/orange) and circuit 36 Y/W (yellow/white) run through connectors C153 and C154 to the IAR B+ and A terminals; the IAR detail is on page 12-1.
Which connector is excluded on the Bronco?: Connector C105 in the 37 Y circuit is footnoted '* ALL EXCEPT BRONCO'.
Where do the battery grounds attach?: Battery negative (BK) runs to G103 (engine ground) and G101 (body ground); ground details are on page 10-3.