Alternator Replacement Instructions

Here is a guide to help help walk you through the repair with instructions in the diagrams below to show you how to do the job on your car.

https://www.2carpros.com/articles/how-to-replace-an-alternator

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

I was replacing the alt 100 fusible link. I was removing the old one when my wrench touched the side of the car and sparked. i installed the new fuse, but now nothing electrical works?

check main fuse. hope all comes back to life. computers hate power surges

Roy

I replaced the main, still nothing, tomorrow I'm gonna back through and double check to make sure everything is connected properly, then got through the fuses and check them. Why wouldnt the lights come back on? The hood light? all of them are out??

no power

Roy

In my fuse box there is an engine main (relay) and a 40a main, they both seem to be conducting fine with my fuse tester. Is there somewhere else I need to look, or another main fuse? I checked all the other fuses and they all seem to be fine.

When working on fuses, especially main fusible links, the battery negative terminal should ALWAYS be disconnected.

Recheck the battery connections. If the terminals are not tight, sparking can result in loss of contacts.

I removed the serpentine belt and the two mounting bolts (top and bottom) from the alternator. While it will swivel forwards towards the rad, I am unable to pull it out, am I missing something?

The bracket has a bush that contracts the distance between the alternator base when blt is tightened. Rock the alternator sideways to move the bush outwards to gain clearance. This would allow easier installation.

Got it solved! My brother came over with his volt/ ohmmeter, we knew power wasn't getting to the fuse box, but why? Plus he figured there has to be another main fuse or fusible link. We found a fusible link (wire ) coming off the pos+ battery terminal which thel leads to the fuse box. Power was not getting past/ through this fusible link, so we ended up replacing this for a trip to the auto parts store and less than $4, and all is well again! Learned some very good lessons in this adventure!

Nice work.

When working on electrical diagnostic and testings, a DVOM or test light is the minimum requirement.

On last Friday, after several days on not using, when I drove the car, the battery light was on, and the steering wheel was heavy. I thought the battery was low, so I started the engine and kept it running idle for about 20 minutes. The next morning, I noticed that the battery light on the display area was still on, and the coolant was low, so I added some coolant and drove to Advanced Auto Parts to change the battery. After the change, I noticed that the battery light was still on, and all the visible belts liking to the Alternator, Air Conditioning, and Fan were not running, the Steer wheel was still heavy, and after only 2 mile drove home, the coolant was boiling and the coolant level dropped below the minimal level after the it cooled down.

I don't know if it an electrical or mechanical problem and how much will it cost to repair it.

It sounds like you are missing at least the belt that goes to the bottom pulley, or the crankshaft pulley, if this one is missing, non of the others will turn, so you will not charge the battery, turn the power steering pump, or the water pump, fix the belts bfore you drive it again, if you keep overheating this motor, you will have a major engine repair to worry about.

In replacing the alternaor , it seems that the bottom
bolt holding the alternator frame or core to the engine is out of sight and out or reach .

How is this bolt grasped with a socket or wrench and is there a special tool or way to reach it ?

yes, the bottom bolt is hard to see, it needs to be remove from under the vehicle. Support the car safely and remove the bolt from the bottom. Please let us know how it went. :-)

How do I replace the alternator on my 94 corolla. and should I use an OEM replacement only or does it matter

Thanks

Disconnect the battery cable
remove serpentine belt
disconnect alternator wire harness connector
remove battery nut and wire from the back of the alternator
remove mounting bolts remove alternator
good luck

I want to know how much tenchine I need to have on the belt before I afix the bolts for the car to run correctly.

Hi there,
About 5-10 mm deflection on a new belt and you may have to do a re adjust after a week or so as they will stretch a bit at first.

Mark (mhpautos)

1990 Toyota Corolla 6 cyl Automatic

how do i tell what alternator i have so i can replace it

The details should be on the back of the alternator.

mark (mhpautos)

All Corolla's had the Denso Alt.

Just get a remanufactured Denso unit, it will say Denso on it.

how do you replace the alternator?

Disconnect the negative battery cable. Disconnect the electrical wiring from the alternator. Loosen the adjusting lock bolt (lower bolt) and pivot (upper) bolt. Remove the drive belt. It may be necessary to remove other belts for access.

Remove the lower bolt first, support the alternator and remove the upper pivot bolt. Remove the alternator from the car. Installation is the reverse of the removal procedure. When reinstalling, remember to leave the bolts finger tight so that the belt may be adjusted to the correct tension. Make sure that the electrical plugs and connectors are properly seated and secure in their mounts. Adjust belt tension and tighten all necessary hardware. Tighten the pivot bolt to 45 ft. lbs. (61 Nm) and the lock bolt to 14 ft. lbs. (19 Nm). Reconnect the negative battery cable. Reset any digital equipment such as radio memory and the clock if necessary.

I need some serious help with my altenator. i bought the car from my mom a while back and just recently the car just wouldnt start for anything. i figured it was the starter but after i replaced it about 6 hours later car just died. i was told it was my alternator. i got the old alternator out the problem i'm having is getting the new one in. any information you vcould give me would be much apreaciated.

Hi there,

If you are having a problem fitting the Alternator just check that where the main support bolt goes through the alt, there should be a bush that can be tapped back to open the gap so it will mount on the engine, this is self adjusting when you re tighten it,

Mark (mhpautos)