A reference for owners, restorers and anyone keeping a Sinclair C5 on the road: every part, what it does, what goes wrong, how to fix it, and where to find a replacement or reproduction. Each page cites its sources: the 1985 Owner's Handbook, Hoover's service and assembly documents, the Unofficial Service Manual, and decades of owners' experience.

Restoration news, design work and the stories behind the C5 are on the main site, c5.me.uk.

Open a system to see its parts and add-ons, or use the search box at the top.

The complete parts list, with original Sinclair part numbers, is on the parts list page.

Buying a C5 · Restoring a C5 · Driving and maintenance · Fault finding · How the electrics work · Batteries and charging · The law

History (timeline, people, production, the C5 in the Netherlands) · Original documents · Stories on c5.me.uk

About this wiki (sources and how pages are written) · Diagrams wanted