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Wiring Diagrams

Complex factory diagrams redrawn as simple pictures — with pin numbers and wire colours.

All Cars› General Guides› All years› Power & Fuses
Battery12 VAlternatorVoltageregulatorrotor + stator(makes the power)Main fuseBIgnitionIG fuseIGSS = senses battery voltageBattery light (meter)L1234
All CarsGeneral GuidesAll years

Alternator Charging Circuit (B, IG, S, L) — Battery Light Explained

How the alternator charges the battery, what terminals B, IG, S and L do, and how to test charging.

RelayBattery12 VSwitch / ECUCoil8685Fuse3087a87Load(fan, horn, lamp…)1234
All CarsGeneral GuidesAll years

Relay Pinout 30, 85, 86, 87, 87a — How a Car Relay Works

What each relay pin does, how to wire it and how to test a 4- or 5-pin relay.