Today im going to show you how to replace a alternator. This is a really simple job that you can do yourself.

In most cases there’s no special tools and to figure out how easy the job is going to be all you have to do is locate your alternator. in my truck you can see the alternator is right at the top which makes it really easy to get to.

if your alternator’s near the top of the engine, the job is going to be simple. if the alternator is buried, it could be more difficult.

if you’re not sure if your alternator is bad i have a post that shows you how to test an alternator so check that out it’s really simple and you could do it yourself

Here is where my alternators having a problem. when the engine goes about four thousand rpms the battery light comes on and the voltmeter that’s built into my truck. it just drops there should be 14.2 volts.

I’m getting like 10 volts , nine volts once the RPM to about four thousand rpms so not only is the alternator shot but i’m running a large light bar up top and some lights in the rear as well as off road lights in the front

so I want a larger alternator to keep up with my electrical demand stock alternators 95 amps and the new alternator is a hundred and thirty amps

so let’s go get started and changing this. We have a ratchet extension and different sized sockets metal wire , brush flathead , screwdriver and PCs

and we have a torque wrench breaker bar and the only specialty tool that you don’t really need but i have is a serpentine belt tool . that helps get the serpentine belt off

You could always just use your breaker bar or a long wrench

so let’s begin . Anytime you work on the electrical system the first thing you want to do especially when changing out the alternator take off the negative terminal on your battery , make sure it’s not getting grounded out

the next step is you need to access your alternator . so try to make your life easier and make as much room as possible . we really don’t want to take off the coolant hose because then you get cool and everywhere but what we can do is take off this intake hose which is really easy to do

To get the intake hose off, there is a hose clamp, use a flathead screwdriver

Now we’re just going to disconnect this hose that’s over here and just wiggle this off. we come over here to our mass air flow sensor, disconnect the little mass air flow sensor electrical clip

We could just take this off just like that , always always remove your filters , you don’t damage it and we can have easy access.

Now let’s go take the belt off . it’s just like a long ratchet if you have a breaker bar , that’s kind of narrow and skinny , you can use that or if you have a long wrench in this case this is 15 millimeter

and what you’re going to do is going to go down into the pulleys and look for the tensioner pulley so the tensioner pulley is the spring-loaded pulley and that’s how you relieve the belt tension to just go down, get the tool on the end of the bolt of the tensioner

and just take it and you pull the ratchet the tool whatever you have towards you and that pushes the pulley against the tensioner spring so you relieve the pressure and now the belt is nice and loose

and since we’re only taking off the alternator and make your life a lot easier to just take off the belt on the alternator and i’ll leave the belt popped

so it doesn’t come apart and unwrapped from around these pollies just in case if it does , there is the diagram of how the belts rat around the police

now let’s go take the alternator off , taking the alternator off is really easy you can check your brand-new alternator to see how many bolts has . You are looking for three bolts to take off , looking at the alternator, we’re good to go

before we do that I want to check the back of the alternator see what connections you have. you can see that there’s three connections. I usually like to get these off before I remove the alternator especially since there’s plenty of room to get to him back

so let’s go do that, the first cable we’re going to take off is the red battery cable . This is the power from the alternator to the battery, runs all the way up over to the battery – 10 millimeter and you suck it over that good although our negative terminal is technically disconnected just cover this up

so it doesn’t groundout better to be safe than sorry .You can even get some black electrical tape if you want but that’s good enough

Now we’re going to remove this connector and this connector flathead screwdriver might help . if you remove this wiring harness and move it up to the side, removing the actual alternator is really easy

we’ll start off with this front bolt, there’s three bolts total , going to use a breaker bar with . These bolts are kind of tough. The original alternator cars 2001 so it’s pretty old good broke that free will do the bolt . And then there’s one more bolt right back here.

Okay all three bolts are broken free. now we can loosen them up all the way . i can pull out the old one. what the alternator out we have this alternator bracket and you just want to get a piece of sandpaper or in this case I have a metal wire brush

and just want to clean up the connection where the alternator actually sits on. Because the alternator is grounded to the block through a bracket so the better the connection to the alternator the better your electrical system will perform

You also want to grab the bolts and clean off the bolts .you can see there’s all the white corrosion on the threads, you want to have a good connection so it’s good to clean this off and that cleaned up very nicely

so we’re going to get even better connection. so with all the bolts cleaned up and with the connections here all cleaned up, let’s go put the new alternator on

as always when i’m installing two new parts, i like to put them side by side make sure that they look right

now we’re going to get our new alternator , put in place .one thing you might consider on bolts as anti-seize just put a little bit on and using just a little bit of anti-seize on the threads are just make it that much easier to get off if you ever need to replace this in the future

now we’ll get our top bolt in , you just want to get it started. You want to be able to move this alternator around to make sure you get the next bolt in its position and then the last one should slide right

so now with all three bolts hand tightened and thread it in , we could start tightening them down. you don’t want to tighten them down all the way, just get them snug and then we’ll talk from them

so now that all these are snug . we’re going to get our torque wrench and set it between 30 and 40 foot pounds

i’m doing thirty eight foot pounds 1 2 three. All we have to do is connect these wires , connect our intake and we’re ready to go for a test drive plug that in love that in , make sure you have a good connection

to use your metal wire brush just to make sure it’s clean or some sandpaper whatever you got take the nut off slip the power cable over the stud and hand-tighten good but make sure you slide this protective boot over that just feels at any water and also prevents any unintentional grounding so we got our top connected

that middle one connected and our power line connected make sure that we have our plastic piece over the alternator . it’s just the heat shield that protects the alternator from the excess heat

Now we’re just going to get the belt on the alternator and you see it doesn’t fit until we pull this good the belt is on here correctly on the rest of the pulleys correctly

now we can take off our belt tool, just inspect to make sure that the belt is on all the pulleys correctly . it’s in the middle. it’s not on the edge plus the belt was a little loose if it’s right on perfect, everything looks good on the tensioner

now let’s put on the air intake and let’s go for a rod drop our filter back in place this clicks in just like so you want to make sure that this hose goes all the way around your intake just like

so there’s no gap. we can get our flat head screwdriver to tighten the down, remember to connect our PCV hose good , make sure you plug in the mass air flow sensor

one last thing to do… connect our negative terminal and let’s go for a ride. let’s start it up.


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