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ELECTRICS

The black  wire coming out of the Indicator and running to seemingly nowhere is actually the earth wire and runs to body to complete the circuit. Lucas use black for all their Earth wires to make identification easier. The symbol              at the end of the black wire is an earth symbol and shows that the wire is connected to the body or chassis.

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Below is an actual part of the Series 3 wiring diagram showing the layout of the N/S/F and N/S/R indicators back to the switch which in this case would be the stalk on the steering column. When dealing with a wiring diagram I would recommend looking at it in sections like this to minimise confusion. The wiring colours starting from the switch are given as GR then into G then once past the bulb are shown as B. The colour codes are represented by a key below the diagram but in this case

GR = Green/Red      G= Green       B= Black.

So if you were to look at the indicator itself there would be a green wire and a black wire coming from it. But the diagram shows that at the switch end it turns into a Green and Red wire. Without the diagram you would be looking for a Green wire at the switch which you wouldn’t find. This is how a wiring diagram can help you and save you hours!

SWITCH

GREEN/RED WIRE

BLACK WIRE

N/S  FRONT/REAR INDICATOR BULBS

GREEN WIRE

I hope this helps you to under stand wiring diagrams and encourage you to use them. I wouldn’t recommend picking one up for the first time on the side of a road in the middle of the night in the pouring rain to try and get you out of a fix. Instead take your time and have a look at one when your not relying on it to get you back on the road. Practice using it to trace different wires around your vehicle so that you gain confidence and understanding of the wiring layout. If you find that a previous owner has rewired it using all the same coloured wire then………good luck and all the best. If this is the case you could attach labels to wires to help identification by a process of elimination. Start by disconnecting one wire at a time and see what stops working. Keep going to you get an understanding of what goes where. Failing that having a friend with a correctly wired up vehicle for a comparison will help you no end.

A seemingly standard wiring set up will no doubt over the years will have been modified/repaired or bodged by someone in the past so it make sense to go over your wiring before problems arise. The most common mistakes people make when ‘repairing’ wiring looms is to use incorrect thick nesses of wires, poor or weak connections or over loading of existing wiring. The worst case scenario will result in the vehicle catching fire…….you have been warned. I will cover different methods of connecting wires a bit further on in this section.


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REFERENCE

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