2CV voltmeter – connector

Auto electrics aren’t exactly a paragon of reliability so couple that with a classic car and anything to help out is useful. Of particular use is a voltmeter as this will often give an early indication that something is amiss.

Whilst the Club speedo came with a “battery condition meter” the Spécial’s dashboard was more minimalist. Fortunately – as with the dashboard indicator lights – Citroën used the same wiring loom for both models so the live connector for a voltmeter is already there. However, one live connector isn’t enough for an after market voltmeter, it also needs an earth and a live for illumination. As the voltmeter on the Club was part of the speedo that already had earth and illumination no additional connectors were provided so an extension to the wiring loom will be needed.

As I’ve not decided how and where to mount the voltmeter I want to make the job of connecting it to the wiring loom easier so I went for a short set of leads from the dial terminals to a connector block. This means the hard to reach connections to the dial and the wiring loom can stay attached and the connector can be in a more accessible place.

The practicalities of building the voltmeter connector were pretty simple but, having learnt from deciphering the colour confusion behind the dashboard, I made sure I kept the wiring well distinguished. I settled on the following colour scheme:

  • Voltmeter live: red
  • Illumination live: green
  • Earth: black

Again, having learned from building the LED dashboard indicator lights, I made sure that the spade terminals were appropriately colour coded with insulating tape.

Voltmeter connection block

With the connector made up it fits onto the terminals of the voltmeter and the connection block can be presented in a more accessible location giving more scope for finding a practical mounting point in the car.

Voltmeter with connector block