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1985 Honda CB450SC Nighthawk Electrical Replacement Priorities

Build an electrical order for your 1985 CB450SC Nighthawk around the component and connection needing attention. Charging control, oil-pressure warning and turn-signal flashing involve different replacements. Identify the fitted battery, connectors and original references before deciding which of these service parts belongs in the repair.

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Honda motorcycle parts

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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 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...
Honda CB1100 CB1000 CB900 CB750 starter clutch diode 31700-124-003

Honda CB Starter Clutch Diode ~ Replaces 31700-124-003

$12.88 USD
24-2044
Replace your starter clutch diode with this Stator Clutch Diode/Rectifier, replacing OEM #31700-124-003 / #31700-166-008. Exceptionally broad fitment across the SOHC and DOHC CB750...
Honda CB900 CB750 CB650 CB550 tail light cover screws 93500-04055-4J

Honda CB Tail Light Cover Screws ~ Replaces 93500-04055-4J

$4.69 USD
49-0145
Replace your tail light lens screws with this Tail Light Lens Screws Pack of 10, replacing OEM #93500-04055-4J.Key Features• Tail light lens screws• 10...
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...
New
Honda CB750 CB650 CB550 CB500 battery box rubber 83618-323-000

Honda CB Battery Box Rubber ~ Replaces 83618-323-000

$4.95 USD
99-4986
Upgrade or restore your vintage Honda motorcycle with this Battery Box Rubber — designed to replace OEM #83618‑323‑000 and cushion your battery from vibration...
New
Honda CB1100 CB1000 CB700 turn signal flasher relay 38301-MG9-681

Honda CB Turn Signal Flasher Relay ~ Replaces 38301-MG9-681

$21.86 USD
13-0004
Replace your Nighthawk-era turn signal flasher with this Turn Signal Flasher Relay, replacing a range of OEM references (#38301-MG9-681, #38301-KK9-952, #38301-KK9-951, #38301-MF8-773, #38301-MF8-772, #38301-MB0-004,...
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...
Honda CB1100 CB1000 CB700 CB650 CB550 oil pressure switch

Honda CB Oil Pressure Switch ~ Genuine Honda OEM

$69.95 USD
99-5094
Upgrade or restore your classic Honda motorcycle with this Genuine Honda Oil Pressure Switch — precision‑engineered and made in Japan. This authentic replacement part...
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...
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1985 Honda CB450SC Nighthawk · Electrical Buying guide

Start with the circuit and the fitted replacement reference

The charging unit, warning switch and signal relay offer separate repair choices. Their application lists include the 1985 CB450SC, while their specific connectors, reference numbers and battery requirements determine which replacement is appropriate for the work.

Parts to consider

1978-86 Honda CB450 / CB400 Rectifier / Regulator ~ Replaces 31600-KV8-681 Six-wire charging replacementThe listed unit uses two connector blocks: three yellow wires in one and three wires in a four-space block. Compare the fitted connectors and Honda reference before ordering.View part Honda CB Oil Pressure Switch ~ Genuine Honda OEM Genuine Honda warning switchOne oil-pressure warning switch is supplied for a compatible engine. Its listed references include 35500-MJ4-024; confirm the terminal and sealing arrangement against the original.View part Honda CB Turn Signal Flasher Relay ~ Replaces 38301-MG9-681 Nighthawk signal flasherOne relay is supplied, with one used per compatible motorcycle. Match the original Honda reference and inspect the signal circuit before ordering a replacement for poor flashing.View part

Related parts: Clutch-perch starter safety switch · Individual XD05F plug cap · Battery-box cushioning rubber

Keep charging compatibility tied to the installed battery

The available charging choices have different requirements. Identify the battery first, then compare the connectors and original reference. The lithium-only alternative specifies a 14.0V ±0.2 set point and omits the black sensing lead; those details should be assessed against the battery maker’s requirements before purchase.

Check the warning or lighting circuit before selecting a switch

A replacement switch or relay addresses its own component. The flasher listing calls for checks of bulbs, grounds and connections; the oil-pressure listing calls for verification of actual pressure when the warning remains on. Use those checks to establish the needed part before building the order.

Electrical Order Priorities FAQs

Which charging details must I settle before buying the lithium alternative?

Confirm a lithium-ion battery and its required charging voltage, then compare the replacement connections. The lithium-only unit specifies 14.0V ±0.2 and omits the black sensing lead. It is expressly unsuitable for a standard lead-acid battery.

What should I verify before ordering for an oil-pressure warning that stays on?

The switch listing directs you to stop the engine and verify oil level, wiring and actual pressure using the Honda test procedure. Establish the fault before ordering; a warning-switch replacement cannot remedy an engine that fails to build pressure.

Which signal checks can prevent an unnecessary flasher-relay purchase?

Inspect bulb condition and wattage, grounds, corroded connectors and damaged wiring first. The relay listing identifies these as possible causes of poor flashing. Then compare the original Honda relay reference with the replacement’s stated cross-references before ordering.

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