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1978 Honda CB400A Electrical Parts

Electrical repairs on the CB400A need to respect the Hondamatic’s different controls. Start with the affected circuit, then match the switch, fuse assembly or charging unit to the wiring and battery actually fitted. Choose the correct component before replacing several unrelated parts.

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Honda motorcycle parts

Choose your model and year to see parts listed for your bike.

Honda CB750 CB550 CB500 CB450 CB400 rear brake light switch

Honda CB Rear Brake Light Switch

$10.33 USD
12-0008
Replace your rear brake light switch with this Rear Brake Light Stop Switch. Exceptionally broad fitment across the SOHC CB750 lineup and virtually the...
Honda CB900 CB750 CB650 CB550 CB500 oil pressure switch 37240-P13-013

Honda CB Oil Pressure Switch ~ Replaces 37240-P13-013

$23.95 USD
73-0825
Replace your oil pressure switch with this Oil Pressure Switch, replacing OEM #37240-P13-013.Key Features• Oil pressure switch• Replaces OEM #37240-P13-013• Honda part name: Switch...
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 CB1100 CB1000 CB900 CB750 CB650 spark plug cap XD05F

Honda CB Spark Plug Cap ~ XD05F

$10.49 USD
23-3119
Replace your spark plug caps with this Spark Plug Cap, XD05F type. Two required per CB750. Key Features• Spark plug cap, XD05F• 2 required...
New
Honda CB750 CB650 CB550 CB450 headlight setting collar 61304-292-000

Honda CB Headlight Setting Collar ~ Replaces 61304-292-000

$4.50 USD
07-4645
Restore headlight mounting with this Headlight Setting Collar, replacing OEM #61304-292-000. Exceptionally broad fitment across the classic Honda lineup, from the SOHC and DOHC...
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...
Honda CB750 CB550 CB500 CB400 CB360 front turn signal stay

Honda CB Front Turn Signal Stay

$12.95 USD
11-2167
Replace a damaged front signal stay with this Front Signal Lamp Stay in chrome. Body length 65mm, thread 25mm, total length 90mm. Pairs with...
Honda CB1100 CB1000 clutch lever brake light switch 35330-413-003

Honda CB Clutch Lever Brake Light Switch ~ Replaces 35330-413-003

$15.95 USD
29-7029
Replace your front clutch lever safety stop switch with this Clutch Lever Stop Switch, replacing OEM #35330-413-003. This is the switch that allows the...
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 CB750 CB500 CB450 CB400 turn signal lamp gasket 33443-268-671

Honda CB Turn Signal Lamp Gasket ~ Replaces 33443-268-671

$4.61 USD
11-2085
Service your early CB750 or classic twin turn signal with this Turn Signal Lamp Gasket, replacing OEM #33443-268-671. Pairs with our signal lens #11-2110...
Honda CB750 CB550 CB450 CB400 rear turn signal rubbers pk 2 33606-371-000

Honda CB750 / CB550 / CB450 / CB400 Rear Turn Signal Rubbers Pk/2 ~ Replaces 33606-371-000

$15.95 USD
73-0834
Replace your rear turn signal rubbers with this Rear Turn Signal Rubbers Pk/2, replacing OEM #33606-371-000. These are the rubbers that go under the...
New
Honda CB450 CB400 ignition coil 30530-413-003

1978-82 Honda CB450 / CB400 Ignition Coil ~ Replaces 30530-413-003

$44.95 USD
17-4542
Replace your CB400 or CB450T ignition coil with this Ignition Coil, replacing OEM #30530-413-003.Sold each, order the quantity you need.Key Features• Ignition coil• Replaces...
New
Honda CB450 CB400 fuse box assembly 38200-413-003

1978-82 Honda CB450 / CB400 Fuse Box Assembly ~ Replaces 38200-413-003

$54.95 USD
11-2106
Rebuild your CB400 family fuse box with this Complete Fuse Box Assembly (fuses included), replacing OEM #38200-413-003. Fits the full CB400 range from 1978-82...
New
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Honda CB450 CB400 ignition coil 30530-413-003

1978-82 Honda CB450 / CB400 Ignition Coil ~ Replaces 30530-413-003

$69.95 USD
24-2035
Replace your CB400 or CB450T ignition coil with this Rick's Electric Ignition Coil, replacing OEM #30530-413-003.Sold each, order the quantity you need.Key Features• Rick's...
Honda CB450 CB400 ignition switch 35100-MC0-671

1978-82 Honda CB450 / CB400 Ignition Switch ~ Replaces 35100-MC0-671

$24.95 USD
12-0053
Fit the rectangular connector block style ignition switch on your CB400 family bike with this Ignition Switch Assembly featuring a rectangular connector block with...
Honda CB450 CB400 CB360 tommaselli type headlight bracket set 32-34mm

Honda CB Tommaselli Type Headlight Bracket Set ~ 32-34mm

$39.95 USD
09-0015
Fit the Tommaselli look to your smaller-bore Honda with these 32-34mm Tommaselli-Type Headlight Brackets, supplied with rubber mount inserts. Sized for 33mm fork tubes...
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...
Honda CB400A CB400TII front brake light switch assembly 35340-413-013

1978 Honda CB400A / CB400TII Front Brake Light Switch Assembly ~ Replaces 35340-413-013

$24.95 USD
12-0040
Replace your CB400A or CB400TII front brake stop switch with this Front Brake Stop Switch Assembly, replacing OEM #35340-413-013.Key Features• Front brake stop switch...
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1978 Honda CB400A · Electrical Buying guide

Match the circuit to the Hondamatic

The front brake-light switch, fuse box and charging regulator solve different jobs. The CB400A has a parking-brake lever instead of a manual clutch lever, so a familiar-looking handlebar switch still needs careful identification.

Parts to consider

1978 Honda CB400A / CB400TII Front Brake Light Switch Assembly ~ Replaces 35340-413-013 Front brake-light switch1978 CB400A application; replaces reference 35340-413-013.View part 1978-82 Honda CB450 / CB400 Fuse Box Assembly ~ Replaces 38200-413-003 Fuse box with fusesComplete replacement assembly with fuses included; reference 38200-413-003.View part 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

Keep control-switch functions clear

A brake-light switch reports brake operation; it is not an ignition switch or a substitute for another handlebar control. The featured front switch specifically covers the 1978 CB400A. Use Honda’s wiring information when tracing a fault around the Hondamatic parking-brake and starting controls.

Choose charging parts around the battery

The six-wire regulator uses two separate connector blocks. A different Rick’s option in this category is expressly lithium-only and omits the black signal wire. Identify the installed battery and wiring first rather than selecting a regulator only because the mounting looks similar.

Electrical questions

Can I use manual-Hawk clutch-switch advice on this bike?

The CB400A has a torque-converter drivetrain and a left parking-brake lever. Identify a switch by its actual circuit and the Honda wiring diagram; do not assume that manual-clutch starting-switch advice describes the Hondamatic.

Does the replacement fuse box include fuses?

Yes. The featured complete fuse-box assembly includes fuses. Compare its mounting and electrical connections with the existing box, and follow the applicable Honda circuit ratings rather than changing ratings to mask a fault.

Are the two charging regulators interchangeable for every battery?

No. The lithium-compatible Rick’s unit is expressly unsuitable for standard lead-acid batteries. Its specified set point and missing black signal wire also need to suit the chosen battery and wiring arrangement.

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