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1979 Honda CB400TI Hawk I Charging System Parts

The 1979 Hawk I’s original kick-start arrangement does not remove the need to choose charging parts carefully. The two rectifier/regulator options differ in their wiring and battery requirements. Identify the battery installed, then compare the connectors and documented specifications before making the replacement choice.

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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....
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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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1979 Honda CB400TI Hawk I · Charging System Buying guide

Let battery chemistry guide the regulator comparison

The six-wire unit and the lithium-only regulator are not interchangeable choices based on appearance. Record the battery specification and existing connector layout so the charging replacement can be checked as a complete match.

Parts to consider

1978-86 Honda CB450 / CB400 Rectifier / Regulator ~ Replaces 31600-KV8-681 Six-wire rectifier/regulatorTwo connector blocks carry six wires: three yellow wires together, with the other three wires in a four-position block.View part 1978-86 Honda CB450 / CB400 Rectifier / Regulator ~ Lithium Ion Battery Compatible Rick’s lithium-only regulator14 V ±0.2 V set point; the design omits the black signal wire. For compatible lithium-ion batteries only, never standard lead-acid batteries.View part

Keep track of occupied connector positions

The six-wire option groups three yellow wires in one block and three other wires in a four-position block. Compare the occupied positions as well as the housings. Connector shape alone does not explain the electrical match, especially where the harness has been repaired.

Apply the lithium restriction to the whole purchase

Rick’s lithium-only unit uses a 14 V ±0.2 V set point and omits the black signal wire by design. Confirm that set point with your battery manufacturer. Do not use the unit with a standard lead-acid battery or copy its specifications onto the other regulator.

Common buying questions

Can I buy the lithium regulator now and keep my lead-acid battery?

No. Rick’s specifies this version for compatible lithium-ion batteries and excludes standard lead-acid batteries. Choose the regulator for the battery being used, and have any planned battery conversion checked before purchasing the charging parts.

Is the missing black signal wire a fault in the lithium unit?

No, the manufacturer specifically describes that wire as omitted from this design. That is a product distinction, not an instruction to remove wiring from the motorcycle; use the correct manufacturer instructions for the exact unit.

How can I recognize the six-wire regulator’s connector arrangement?

The six-wire unit has two connector blocks: three yellow wires in one, and three other wires in a four-position block. Compare the occupied terminals with your harness, particularly if its wiring or connectors have been changed.

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