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  • 1970-82 Honda CB125S / CB100K Turn Signal Flasher Relay ~ Replaces 38310-428-671
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Honda CB125S CB100K turn signal flasher relay 38310-428-671
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Honda CB125S CB100K turn signal flasher relay 38310-428-671

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1970-82 Honda CB125S / CB100K Turn Signal Flasher Relay ~ Replaces 38310-428-671

12-0104
$15.82 USD
In stock Usually ships the same or next business day
Check model fitment View fitment
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60-day returnsEligible unused parts Free ground shippingUSA & Canada over $50
Browse all parts
1970-82 Honda CB125S / CB100K Turn Signal Flasher Relay ~ Replaces 38310-428-671
$15.82 USD
Description

Replace your CB100 or CB125S turn signal flasher with this Turn Signal Flasher Relay, replacing a range of OEM references (#38310-428-671, #38300-GF0-405, #38300-243-670, #38300-089-671, #38300-428-004, #38301-428-671, #38301-428-004). 6 Volt, 17W, 2-prong style.

Does NOT work with LED turn signals, see our #12-0130 LED-compatible relay if converting to LED.

Key Features
• Turn signal flasher relay
• 6V, 17W, 2-prong
• Replaces multiple OEM references
• NOT LED-compatible
• Honda part name: Relay Assy., Turn Signal

Fitment / Compatibility

• Honda CB100K (1970‑71)
• CB125S (1976 / 1978‑82)

Part Number: 12-0104

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Check the listed model and year, then read any fitment notes in the description.

Make Model Year
Honda CB100K0 1970
Honda CB100K1 1971
Honda CB125S3 1976
Honda CB125S5 1978
Honda CB125S 1979
Honda CB125S 1980
Honda CB125S 1981
Honda CB125S 1982

Free ground shipping over $50

To the USA & Canada. In-stock orders usually ship from our own warehouse the same or next business day.

Estimated ground delivery after your order ships
DestinationDelivery time
USA4–7 business days
Canada2–6 business days

Ground shipping includes tracking, emailed when your order ships. Need it sooner? Express options are available at checkout.

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60-day returns on eligible parts

No restocking fees. Eligible parts must be unused, uninstalled, unaltered and complete. The 60-day window starts when your order is delivered.

Electrical parts are excluded from standard returns. Check return eligibility.

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Other shipping options

Canada Post Economy: Available at checkout for select small items. Allow 1–3 weeks for delivery. No tracking or insurance is included.

Outside the USA & Canada: Delivery times vary by destination and shipping method. Buyers are responsible for applicable duties, taxes and import fees. We cannot mark orders as gifts.

Frequently Asked Questions

Which Honda years use this 6V flasher relay replacing 38310-428-671?

The 6V, 17W, two-prong relay fits the 1970-71 CB100K and the 1976, 1978, 1979, 1980, 1981 and 1982 CB125S. It should not be ordered for the omitted CB125S years without a confirmed cross-reference.

How many flasher relays are needed for one CB100K or CB125S?

One relay is included and one is used for the motorcycle's turn-signal circuit.

Will this Honda 6V flasher relay work with LED turn signals?

No. It is for conventional 6V turn-signal loads and is not LED-compatible. Use LED flasher relay 12-0130 when converting the turn signals to LEDs.

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