Worn out alternator brushes are the most common reason an alternator fails or breaks down. Learn how to replace the alternator brushes in these free auto repair video instructions featuring a certified mechanic.
In this clip, we're going to talk about the proper service procedure to remove, inspect, and overhaul your vehicle's alternator. In this step, we're going to talk about the proper service procedure for replacing our brushes and reloading our voltage regulator. Let me turn the regulator over, and you'll see we have two more screws. The screws that go into the plastic only, are actually the bolts that hold the brushes on. They have little slip nuts here that slide down inside the plastic, and are held in place. You're going to want to be very careful when loosening these. They are lefty-loosey, righty-tighty. If you over-tighten them, they will break. Go ahead and remove it right here. Just like so. Take and dump that out in my hand. I'm going to set this on my magnetic tray. And as you can see, we can slide our brush out. Now, the nut is going to stay there, but it will drop out if you tip it over. So, you're going to want to make sure to keep an eye on that so your nut doesn't slip out on you. Go ahead and put that guy back where he goes, and remove the next retaining bolt. Just like so, and slip my brush out, oops, and set it aside, let's slip my nut back in, just like so. What I'm going to do is take the metal part of the brush and slip it down between the retaining nut and the housing. From here I'm going to just go ahead and slip this screw in there to hold it in place. Now, I'm going to run it down just a few threads. We're going to be re-disassembling this here shortly. On the other side, I'm going to take and drop my nut back in, and slip it in in a similar fashion. Just like so. I'm also going to spin that retaining nut in, a retaining bolt, for that matter, just like so, just a few threads until we get it loaded. Now how you load the voltage regulator, we're going to take a spring, they come with new springs, drop it down inside. Take another spring and drop it down inside, just like so. Now the wire is going to take and loop around down through here and slip inside, just like that. Once you have that in there, we're going to take and slip a toothpick through this hole here. Just like so. We're going to take a small screwdriver and depress the brush until we can get our toothpick inside. As you can see that there, we're using the toothpick to take and hold our brush down in there. We're going to take and load the other side, this wire, and you can see there is a slot, your wire is going to ride up and down in that slot, just like so. Again we're going to take our small screwdriver and compress that spring and slide our toothpick through into position. Just like that.