Alternator Replacement Instructions

Tiny
ANGIEBEAN1972
  • MEMBER
  • 2002 TOYOTA COROLLA
When replacing a alternator for a Toyota Corolla, do you have instructions?
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Saturday, January 16th, 2010 AT 11:44 AM

26 Replies

Tiny
MMPRINCE4000
  • CERTIFIED MECHANIC
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.
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Sunday, January 17th, 2010 AT 7:01 AM
Tiny
VILLENBOB
  • MEMBER
  • 1998 TOYOTA COROLLA
  • 187,000 MILES
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?
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Monday, August 24th, 2020 AT 2:14 PM (Merged)
Tiny
ASEMASTER6371
  • CERTIFIED MECHANIC
Check main fuse. Hope all comes back to life. Computers hate power surges

Roy
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Monday, August 24th, 2020 AT 2:14 PM (Merged)
Tiny
VILLENBOB
  • MEMBER
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?
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Monday, August 24th, 2020 AT 2:14 PM (Merged)
Tiny
ASEMASTER6371
  • CERTIFIED MECHANIC
No power

Roy
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Monday, August 24th, 2020 AT 2:14 PM (Merged)
Tiny
VILLENBOB
  • MEMBER
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.
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Monday, August 24th, 2020 AT 2:14 PM (Merged)
Tiny
KHLOW2008
  • CERTIFIED MECHANIC
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.
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Monday, August 24th, 2020 AT 2:14 PM (Merged)
Tiny
MASON50001
  • MEMBER
  • 1998 TOYOTA COROLLA
  • 130,000 MILES
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?
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Monday, August 24th, 2020 AT 2:14 PM (Merged)
Tiny
KHLOW2008
  • CERTIFIED MECHANIC
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.
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Monday, August 24th, 2020 AT 2:14 PM (Merged)
Tiny
VILLENBOB
  • MEMBER
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!
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Monday, August 24th, 2020 AT 2:14 PM (Merged)
Tiny
KHLOW2008
  • CERTIFIED MECHANIC
Nice work.

When working on electrical diagnostic and testings, a DVOM or test light is the minimum requirement.
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Monday, August 24th, 2020 AT 2:14 PM (Merged)
Tiny
DENGJIANJIN
  • MEMBER
  • 1997 TOYOTA COROLLA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 123,000 MILES
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.
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Monday, August 24th, 2020 AT 2:14 PM (Merged)
Tiny
MERLIN2021
  • CERTIFIED MECHANIC
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.


https://www.2carpros.com/forum/automotive_pictures/62217_corrolla_1.jpg

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Monday, August 24th, 2020 AT 2:14 PM (Merged)
Tiny
ANDY GRANA
  • MEMBER
  • 1996 TOYOTA COROLLA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
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?
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Monday, August 24th, 2020 AT 2:21 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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. :-)
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Monday, August 24th, 2020 AT 2:21 PM (Merged)
Tiny
MOUSE POTATO
  • MEMBER
  • 1994 TOYOTA COROLLA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 198,000 MILES
How do I replace the alternator on my 94 corolla. And should I use an OEM replacement only or does it matter

Thanks
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Monday, August 24th, 2020 AT 2:21 PM (Merged)
Tiny
BMRFIXIT
  • CERTIFIED MECHANIC
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
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Monday, August 24th, 2020 AT 2:21 PM (Merged)
Tiny
DACESCO
  • MEMBER
  • 1991 TOYOTA COROLLA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 60,000 MILES
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.
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Monday, August 24th, 2020 AT 2:21 PM (Merged)
Tiny
MHPAUTOS
  • CERTIFIED MECHANIC
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)
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Monday, August 24th, 2020 AT 2:21 PM (Merged)
Tiny
SKELLINGTON
  • MEMBER
  • 1990 TOYOTA COROLLA
1990 Toyota Corolla 6 cyl Automatic

how do I tell what alternator I have so I can replace it
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Monday, August 24th, 2020 AT 2:21 PM (Merged)

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