Ignition - Ignition Relay, UK (1977)

Hover over a wire to confirm the colour

Added January 2010: 1977 models, with all switched ignition circuits powered by the ignition relay. Not shown in Advance Autowire on-line version or Haynes, their 'late UK market' diagram is for 1978 and later. It's not known exactly when the change occurred but Peter Mitchell's 1978 model built December 1977 has the later version.

Note 1: There are two separate green circuits - the original circuit fed from the 2nd fuse up in the 4-way block for all the original green circuits, and another fed by an in-line fuse from the white/brown circuit on the relay output for the cooling fan. This fuse is located below the fusebox, probably with the hazard flasher fuse which has brown wires both sides.

Note 2: There are three separate white circuits - one from the ignition switch feeding the ignition relay, another in the rear harness feeding the fuel pump, and the third in the dashboard sub-harness feeding the ignition warning light. These last two are taken off the white/brown circuit from the relay output.

Note 3: The schematics show the original rectangular Lucas relays with W1, W2, C1 and C2 terminal numbering, but in practice cylindrical relays with ISO numbering were fitted. The relationship is as follows:

Wire colourOriginal numberingISO numbering
White from ignition switchW185
Black earthW286
Brown 12v supplyC230
White/brown to ignition powered circuitsC187

Information on the ballast resistance can be found here.