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  2. Questions about the product

Guides

Light does not work after retrofit – checklist without speculation

6 min read·30 Jul 2026

Systematic checklist: plug side, length/variant, CT22 range, pack contents — check steps only, no invented fault diagnoses.

Contents

  1. Checklist
  2. Questions about the product

Checklist

  1. Is the system-side end on the correct port? (BES3 blue / Yamaha system plug / Micro M / open end — per article)
  2. Is the light side correct? CT1B only with a CT1 / Higo Micro B compatible headlight; otherwise check an open-end variant.
  3. Are length and system variant correct (EAN/art. no. vs invoice)?
  4. For open ends: CT22 used for 0.4–0.7 mm and 2-2 polarity correct?
  5. Is voltage present at the light output? (We do not state meter limits here — manufacturer docs / workshop)
  6. Was a workshop/single article mixed up? Same tech, different contents/quantity.

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Placeholder: checklist and multimeter at the bench

Bench with printed checklist, cable and meter — without overlaying specific readings as a product promise.

troubleshoot-guide-checklist

If the checklist does not help: consult a workshop and the technical requirements of drive and lighting. Compatibility describes the connector interface, not a functional guarantee on the complete vehicle.

Questions about the product?

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Author

Christian Treugut

Founder and Managing Director

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More guides

All guides

  • 9 min read·Bosch

    Retrofitting lights on Bosch Smart System – connection and matching cables

    How to connect a headlight with a CT1 / Higo Micro B compatible plug to the Bosch Smart System (BES3) from model year 2022 using our headlight cable – 1300 mm, available as single pack or workshop pack.

    Read guide

  • 8 min read·Litemove

    Connecting headlights compatible with Litemove – CT1 and futurelectric cables

    Which of our cables match headlights compatible with Litemove with a CT1 plug — by drive system and as a CT1 extension.

    Read guide

  • 6 min read

    Single or workshop pack? – Difference and scope of delivery

    Single pack: 1× cable for end customers, with CT22 when the cable has open ends. Workshop pack: always 10× cables of the same spec, without CT22 — connectors for open ends available separately as 100-piece box CT22-BO100.

    Read guide

Last reviewed·30 Jul 2026