What gauge and color are fuse links J, A, and B?

All three fuse links (J, A, and B) are shown as 12 gauge (12 GA), gray.

What wire circuits connect to the Integral Alternator Regulator (IAR)?

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

What fuse protects the trailer battery charge circuit?

A 30A fuse in position Q of the engine compartment fuse box, labeled 'With Trailer Tow Only,' feeds circuit 37 Y to the trailer battery charge relay (page 95-1).

Does connector C105 in the trailer charge circuit apply to the Bronco?

No. C105 is footnoted with an asterisk stating 'ALL EXCEPT BRONCO.'

Where do the battery ground wires go?

Battery negative runs via BK (black) wires to G103 (engine ground) and G101 (body ground); grounds are detailed on page 10-3.

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Ford Bronco/F-Series Power Distribution Wiring Diagram - Gasoline, Page 94

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 303 of 386

This is page 94 of a Ford wiring diagram manual, section 13-1 "Power Distribution, Gasoline," showing the gasoline-engine power distribution circuit. The diagram traces battery power through red (R) wires to the starter relay (page 20-2) and starter solenoid (page 20-2), and through fuse links J, A, and B (all 12 gauge, gray). A callout notes one splice arrangement applies to 4.9L and 7.5L engines only. Circuit 38 BK/O (black/orange) and circuit 36 Y/W (yellow/white) feed the Integral Alternator Regulator (IAR, page 12-1) via connectors C153 (terminal B+) and C154 (terminal A). Fuse links A and B feed circuit 37 Y (yellow) into the engine compartment fuse box, through a 30A fuse at 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). Battery negative goes through black (BK) wires to grounds G103 (engine) and G101 (body), with a grounds reference to page 10-3. The page is useful for diagnosing charging system wiring, fuse link locations, and trailer tow battery charge circuits on Ford gasoline trucks.

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Frequently asked questions

What gauge and color are fuse links J, A, and B?: All three fuse links (J, A, and B) are shown as 12 gauge (12 GA), gray.
What wire circuits connect to the Integral Alternator Regulator (IAR)?: Circuit 38 BK/O (black/orange) connects to the B+ terminals and circuit 36 Y/W (yellow/white) connects to terminal A, through connectors C153 and C154. The IAR detail is on page 12-1.
What fuse protects the trailer battery charge circuit?: A 30A fuse in position Q of the engine compartment fuse box, labeled 'With Trailer Tow Only,' feeds circuit 37 Y to the trailer battery charge relay (page 95-1).
Does connector C105 in the trailer charge circuit apply to the Bronco?: No. C105 is footnoted with an asterisk stating 'ALL EXCEPT BRONCO.'
Where do the battery ground wires go?: Battery negative runs via BK (black) wires to G103 (engine ground) and G101 (body ground); grounds are detailed on page 10-3.