![]() ![]() Subaru typically runs 2x 8 AWG (approximately 6 AWG combined) wires that connect up to the fusebox and the battery. Main Power Cable - This is the large cable that is bolted to the alternator itself. Certain electrical systems, like the headlights, require more power so this gives an external module a little extra say in how much electricity the alternator is supplying. Wire 3 – For the cars that have this wire it’s for an external device (like the ECU) to help regulate how much power the alternator is outputting. Wire 2 – This wire is the battery or voltage sense wire. It is the wire that the alternator uses to figure out how much current it should supply via an on board part called the voltage regulator. This circuit flows to ground because the alternator is grounded via the case when the it's not producing electricity thus completing the light circuit to ground and illuminating the lamp. Second is that while the alternator is not producing electricity the warning light will come on.First is that the amount of current required to excite the alternator is very small.Most manufacturers run this circuit to jump start the alternator through the charge warning light on the dash. Wire 1 – This wire is the trigger to excite the electromagnet (device that creates the electricity) within the alternator. We’ll break down what each wire does below. With an alternator plug there can be either 2 or 3 wires plus the main power cable depending on the model and year of the car. How Does the Alternator Wiring Work in my Subaru? Battery Sense wire - found on newer models.Black Alternator plug - found on newer models.Below are links to the different connector types. The older alternators do not have fuses between the battery sense wire and the rest of the car so you could potentially damage the voltage regulator (part that keeps the power output steady) by using a newer alternator in an older car if something goes wrong. ![]() They all function the same, the differences just lie in the connection points between the chassis and the alternator so it's important to keep the alternator matching the chassis and not matching the engine. There are a few different alternator styles, but generally speaking you want to use the alternator that came with your chassis even if you’re installing a new engine. It's a great in depth read on alternator basics! For the purposes of this post we aren't getting into those details. More details about how the internals of the alternator work can be found by clicking here. The alternator is a part on the engine that uses the spinning of the crankshaft to provide electricity to the car as well as keep the battery charged. What is an Alternator and How Does It Work? ![]()
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