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Message: <blockquote data-quote="Geoff1946" data-source="post: 560545" data-attributes="member: 28452"><p>The car probably has a standard colour code for earth wires. Locate one of the earthing points, usually found (e.g.) near light clusters, especially in the boot, under the dashboard, near the fuse box, etc. If you can find one, and all the wires are the same colour that's the answer to your question.  Alternatively, if you can locate  one of the almost indecipherable wiring diagrams, from a Haynes manual or similar, that should tell you. Probing wires won't work as many load supplying wires will appear to be ground when not powered.</p></blockquote><p></p>