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1978 Honda CB400TI Hawk I Charging System Parts

The 1978 Hawk I is kick-start-only, but its charging components still need correct matching. Choose between the six-wire rectifier/regulator and the lithium-only design by checking the battery, connector arrangement and manufacturer’s charging requirements before ordering a replacement.

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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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1978 Honda CB400TI Hawk I · Charging System Buying guide

Choose a regulator for the fitted battery

Two rectifier/regulator choices serve different battery requirements. The lithium-only unit has a lower set point and omits the black signal wire; those are selection differences to resolve before installation, not interchangeable details.

Parts to consider

1978-86 Honda CB450 / CB400 Rectifier / Regulator ~ Replaces 31600-KV8-681 Six-wire rectifier/regulatorSix wires in two connector blocks: three yellow wires in one block and three wires in a four-position block.View part 1978-86 Honda CB450 / CB400 Rectifier / Regulator ~ Lithium Ion Battery Compatible Lithium-only rectifier/regulatorRick's Electric unit with a 14 V ±0.2 V set point and no black signal wire. Not for standard lead-acid batteries.View part

Compare the six-wire connection

The featured six-wire unit uses three yellow wires in one block and three further wires in a four-position block. Check both connectors against the motorcycle. Do not select a unit just because one plug fits, especially where the charging wiring has been repaired.

Keep the lithium restriction explicit

Rick's lithium-only regulator has a 14 V ±0.2 V set point and no black signal wire. It must not be used with standard lead-acid batteries. Confirm the set point with your battery manufacturer, then follow the regulator instructions for its specific connection arrangement.

Buying questions

Can I use the lithium-only regulator with a standard lead-acid battery?

No. This regulator is specifically excluded from use with standard lead-acid batteries. Select charging components for the battery actually fitted, and confirm compatibility before changing either part of the system.

Why does the lithium unit lack a black wire?

Rick’s design intentionally omits the black signal wire. This is documented by the manufacturer; do not assume that all replacement regulators must have identical wire counts or alter the wiring by guesswork.

Is the six-wire regulator guaranteed to suit a modified harness?

No. Its specified connection is two blocks, with three yellow wires in one and three wires in a four-position block. Compare the occupied positions and consult the appropriate wiring information before ordering for a modified loom.

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