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1978 Honda CB550K Main & Junction Wiring Harnesses

For the 1978 Honda CB550K, the main wiring loom and junction-panel sub-harness are separate listings with stated 1977–78 applications. Compare the section being replaced and its connections before ordering; a smaller connecting harness is not a substitute for the complete main loom.

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Honda CB750 CB550 CB400 pilot turn signal light cover 37600-377-018

Honda CB750 / CB550 / CB400 Pilot Turn Signal Light Cover ~ Replaces 37600-377-018

$54.95 USD
99-4819
Restore your gauge cluster with this replacement Pilot Indicator Light Cover — a direct fit for OEM #37600‑377‑018. This part includes both the front...
Honda CB550F CB550K sub wire harness 32105-390-000

1975-78 Honda CB550F / CB550K Sub Wire Harness ~ Replaces 32105-390-000

$29.95 USD
73-0123
Replace your CB550 sub wire harness with this Sub Wire Harness (Junction Panel Harness), the sub harness on the bike that many electrical components...
Honda CB550K wire harness 32100-404-670

1977-78 Honda CB550K Wire Harness ~ Replaces 32100-404-670

$109.95 USD
73-0128
Replace your CB550K main harness with this Main Wire Harness Loom, replacing OEM #32100-404-670.Note: this fits the model years listed. Other years of CB550...
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1978 Honda CB550K · Wiring Harness Buying guide

Choose the loom section by its connections and purpose

The main harness references the motorcycle’s principal loom. The smaller sub-harness connects the junction-panel components named in its description, so identify which section is damaged before selecting a replacement.

Parts to consider

1977-78 Honda CB550K Wire Harness ~ Replaces 32100-404-670 Main CB550K wiring loomA main harness referencing 32100-404-670, explicitly listed for CB550K 1977–78. Compare the fitted loom and connections before replacing a motorcycle’s altered wiring.View part 1975-78 Honda CB550F / CB550K Sub Wire Harness ~ Replaces 32105-390-000 Junction-panel sub-harnessA separate harness referencing 32105-390-000. Its description identifies junction-panel connections for the fuse box, starter switch and rectifier; compare the section fitted to the bike.View part

Identify the section before stripping out wiring

The main harness and junction sub-harness have different reference numbers and functions. Compare the retained wiring section and its connections with the corresponding listing. Do not assume that buying the main loom also supplies the separate sub-harness, fuse box, switches or charging components shown elsewhere.

Separate loom repairs from indicator-cover repairs

The indicator-cover listing describes front and rear covers with fastening screws, rather than a replacement wiring section. If the problem is a broken cover, identify that housing separately. For loom work, document altered connections and compare them with the main or junction harness before ordering.

Common buying questions

What does the junction sub-harness connect?

Its description identifies the junction-panel wiring for the fuse box, starter switch and rectifier. Compare that small section with the fitted motorcycle; it is a separate product from the main wiring loom.

Can I use the main harness for any CB550 year?

This main-harness description specifically lists CB550K 1977–78 and references 32100-404-670. Match the present loom and connections instead of extending that application to other years or to a motorcycle with changed wiring.

Is the indicator cover another harness section?

No. The indicator-cover product describes front and rear covers with fastening screws. It addresses a housing repair, not main-loom or junction-panel wiring; choose a harness according to the electrical section being replaced.

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