What wire connects the charging circuit to the starter solenoid?

A black wire with red tracer runs to the starter solenoid, passing through two fusible links (FL) along the way.

How many fusible links are shown and where are they?

Two fusible links (marked FL) are shown in the black wire with red tracer between the plug/junction splice area and the starter solenoid.

What wires attach to the VR plug?

The VR plug has a green wire and a yellow wire shown leaving it; the green wire connects toward the orange wire from the alternator.

What happens at the junction splice?

The black wire with red tracer from the alternator meets a yellow wire at the junction splice, which then feeds a plug along with a red wire before continuing to the fusible links and starter solenoid.

Home/ Registry/ Ford/ F-150/ 1975-1979/ 1978 Ford F-150/ Photo supermotors.net/registry/media/129323

1978 Ford F-150 Alternator & Voltage Regulator Wiring Diagram - Wire Colors

Alternator wiring diagram with VR plug, fusible links, and color-coded wires

Wiring diagram of alternator and voltage-regulator circuits showing color-coded wires, plugs, and fusible links.

AI caption June 2004 · Photo 1 of 1

This is a hand-drawn (computer-illustrated) wiring diagram showing the charging system wiring between a Ford voltage regulator (VR) plug and the alternator. On the left, the VR plug connects via a green wire and a yellow wire. On the right side, four wires come from the alternator: an orange wire, a white wire with black tracer, a black wire with red tracer, and a yellow wire. Two intermediate connectors labeled "PLUG" are shown, each marked with a question mark (indicating uncertain identification or terminal). The black wire with red tracer from the alternator passes through a junction splice, joins a yellow wire and a red wire at the second plug, and continues through two fusible links (labeled "FL" in red boxes) to the starter solenoid via a black wire with red tracer. The diagram helps a reader trace which alternator output wires route to the voltage regulator plug, where fusible links are located in the charging circuit, and how the main charge wire (black w/ red) reaches the starter solenoid. It is undated and does not state a specific model year, but it was uploaded for a 1978 Ford F-150 charging system reference.

Is this accurate? Sign in to help verify it.

Frequently asked questions

What wire colors come from the alternator in this diagram?: Four wires come from the alternator: an orange wire, a white wire with black tracer, a black wire with red tracer, and a yellow wire.
What wire connects the charging circuit to the starter solenoid?: A black wire with red tracer runs to the starter solenoid, passing through two fusible links (FL) along the way.
How many fusible links are shown and where are they?: Two fusible links (marked FL) are shown in the black wire with red tracer between the plug/junction splice area and the starter solenoid.
What wires attach to the VR plug?: The VR plug has a green wire and a yellow wire shown leaving it; the green wire connects toward the orange wire from the alternator.
What happens at the junction splice?: The black wire with red tracer from the alternator meets a yellow wire at the junction splice, which then feeds a plug along with a red wire before continuing to the fusible links and starter solenoid.