Main lights
Head lights and parking lights Mk1 and Mk2 68 and 69    Parking lights 1970-on

Head lights and parking lights Mk1 and Mk2 68 and 69

Hover over a wire to confirm the colour

1: Blue/white is main beam, blue/red is dipped beam.
2: Parking lights were unfused on Mk I cars.
3: Mk II cars for 68 and 69 had in-line 10A fuses for the parking lights (one for the front and one for the rear), fitted at the bullet connectors where the main and rear harnesses joined together.
4: Dip-switch moved from floor to column stalk for North America in 1968.
5: Mk1 cars had a map light available when the parking lights were on. Mk2 cars for 68 and 69 may have had a courtesy light operated from door switches as well as the map light.
6: Rubber bumper cars have the front parking lights in the headlights and use their earth wire; the indicators are in the rubber bumpers and have an earth wire which connects to the main harness along with the headlight/parking light earth wire. Note that the factory schematics do not always show these correctly.

The separate front and rear fuses for the parking lights in 68 and 69:

Parking lights 1970-on

Hover over a wire to confirm the colour

1: Headlamp and instrument light wiring is much the same as for earlier cars, except that the dip-switch has now moved to the column stalk for all markets.
2: From 1970 the parking lights were fused from the main fuse box, one fuse for each side.
2: 1970 (all) and 1971 (UK only) models may have had a courtesy light operated from the door switches as well as the map light and switch, now available all the time. After that all models had the courtesy light controlled from door switches only i.e. no map light.
3: 1971 models on had boot (roadster) and load-space (GT) courtesy lights.
4: Rubber bumper models (and North American 1974 models with the split rear bumper) have the number plate lights mounted on the number plate backing plate and wired earths back to the bullets for the reversing lights. 5. Rubber bumper cars had the front parking lights inside the headlights and used the same wired earth. The indicators are mounted in the bumper and also have a wired earth. With North American side-marker lights this means there are three lamp units needing an earth on each side, and with the main harness having two earth wires by the right-hand headlight (one from the earthing point the other to the left-hand headlight) means there are five earth wires to be connected together by the right-hand headlight. This may have used a 6-way bullet connector, or two 4-ways with a short connecting wire.
6. 1977 and later models had switches and heater controls illuminated at night, together with the gauges, clock etc.

The instruments have a single red/white wire going to the bulb holder. The earth is picked up from the instrument case, there should be earth wires under the clamp screw or going to a spot-welded spade on the back of the case (later tachs). UK CB tach and speedo have the illumination bulb at the top and the main-beam and ignition tell-tales at the bottom. UK RB speedo and tach only have illumination bulbs, speedo still at the top but tach now at the bottom. North American Mk2 are similar, details here. Fuel gauge, dual gauge is similar:

However a replacement harness for a 1980 came with holders for capless bulbs, which is probably what is shown here. These are plastic so have an earth wire as well as they cannot pick up an earth from the instrument case, which is now superfluous: (Mark Garrett)