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1978 Honda CB400A Starting & Charging

Starting and charging faults need different replacement parts on the CB400A. The starter relay switches the starting circuit; the regulator manages charging. Two regulator versions have different battery requirements, while linked seals and a terminal boot address specific starter service jobs.

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Currently viewing Starter & Charging System

Honda motorcycle parts

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Honda CB1100 CB1000 starter motor terminal rubber boot 32411-230-000

Honda CB Starter Motor Terminal Rubber Boot ~ Replaces 32411-230-000

$4.61 USD
73-0092
Replace your starter motor terminal cover with this Starter Motor Terminal (Cover) Rubber Boot, replacing OEM #32411-230-000.Key Features• Starter motor terminal rubber boot• Replaces...
Honda CB750 CB550 CB500 CB450 starter solenoid relay 35850-375-000

Honda CB Starter Solenoid Relay ~ Replaces 35850-375-000

$38.95 USD
24-2003
Replace your late-'70s CB starter solenoid with this Starter Solenoid Relay, replacing OEM #35850-375-000 / #35850-286-027. Broad fitment across the late SOHC CB750, CB500T/CB550...
New
Honda CB starter motor seal 60 x 1.4 31206-286-158

Honda CB Starter Motor Seal 60 x 1.4 ~ Replaces 31206-286-158

$5.95 USD
03-0784
Seal up your starter motor with this Starter Motor Seal, size 60 x 1.4, replacing OEM #31206-286-158 / #31206-402-008. Exceptionally broad fitment across the...
New
Honda CB starter motor seal 24.4 x 3.1 91312-MG7-003

Honda CB Starter Motor Seal 24.4 x 3.1 ~ Replaces 91312-MG7-003

$4.50 USD
03-0780
Seal up your starter motor with this Starter Motor Seal, size 24.4 x 3.1, replacing OEM #91312-MG7-003 / #91309-300-000 / #91309-425-003. Exceptionally wide fitment...
Honda CB450 CB400 rectifier regulator 31600-KV8-681

1978-86 Honda CB450 / CB400 Rectifier / Regulator ~ Replaces 31600-KV8-681

$179.95 USD
24-2088
Replace your CB400 or CB450 rectifier/regulator with this Rectifier/Regulator, 6 wires, 3 yellow in one connector block and 3 wires in a 4-space block....
New
Honda CB450 CB400 rectifier regulator lithium ion battery compatible 31600-KV8-681

1978-86 Honda CB450 / CB400 Rectifier / Regulator ~ Lithium Ion Battery Compatible

$189.95 USD
24-2034
Upgrade your CB400 or CB450 to a lithium-ion compatible regulator with this Rick's Electric Rectifier/Regulator, replacing OEM #31600-KV8-681 / #31600-413-008. Designed with a lower...
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1978 Honda CB400A · Starting & Charging Buying guide

Separate starter repairs from charging choices

Compare the standard six-wire regulator with the lithium-only Rick’s unit before ordering. The relay and starter service rubbers perform separate jobs. Identify the electrical fault and the actual battery rather than buying a matched-looking group.

Parts to consider

1978-86 Honda CB450 / CB400 Rectifier / Regulator ~ Replaces 31600-KV8-681 Six-wire rectifier/regulatorTwo connector blocks: three yellow wires in one, three wires in a four-space block.View part 1978-86 Honda CB450 / CB400 Rectifier / Regulator ~ Lithium Ion Battery Compatible Lithium-only Rick’s regulator14 V ±0.2 set point; omits the black signal wire and is not for standard lead-acid batteries.View part Honda CB Starter Solenoid Relay ~ Replaces 35850-375-000 Starter solenoid relay1978 CB400A application referencing 35850-375-000 and 35850-286-027.View part

Related parts: 60 × 1.4 starter seal · 24.4 × 3.1 starter seal · Starter terminal boot

Match the charging-unit design

The six-wire regulator has three yellow wires in one block and three wires in a four-space block. The lithium-only Rick’s unit omits the black signal wire and specifies 14 V ±0.2. Confirm battery-maker requirements before choosing the latter.

Plan the starter service pieces separately

The linked starter seals have different sizes: 60 × 1.4 and 24.4 × 3.1. Identify their locations in the applicable Honda documentation before ordering. The terminal boot protects the external connection, while the relay is a separate electrical component; neither replaces those seals.

Starting & Charging questions

Can the lithium regulator be used with my lead-acid battery?

No. That Rick’s unit is expressly for lithium-ion batteries and is not for standard lead-acid batteries. Its 14 V ±0.2 set point must also match the lithium battery manufacturer’s requirements.

What connectors does the six-wire regulator use?

It has three yellow wires in one connector block and three other wires in a four-space block. Compare terminal positions and the installed harness as well as the connector housings before ordering.

Are the two linked starter seals interchangeable?

They are different specified sizes: 60 × 1.4 and 24.4 × 3.1. Match the removed seal and its service-manual position. Do not substitute one simply because both are listed under starter motor sealing.

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