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Alternator problems?

Tiny
MIRAGE78
  • MEMBER
  • 2002 INFINITI G20
  • 140,000 MILES
I have everything removed but am having issues removing the bottom mounting bolt any pointers will help
Tuesday, November 15th, 2011 AT 10:21 PM

40 Replies

Tiny
KELLY67
  • MEMBER
  • 1 POST
Every thing is loose but there's no room to remove alt bolt.
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Sunday, May 21st, 2017 AT 6:20 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,490 POSTS
Hello,

The lower bolt runs into the engine mount. Remove the engine mount bolts and jack the engine up from below. Here is what Im am looking at (BELOW) Please let us know.
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Wednesday, May 24th, 2017 AT 1:39 PM
Tiny
HANDYMAHOPE
  • MEMBER
  • 1 POST
  • 2002 INFINITI G20
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 186,800 MILES
I have a problem with lower bolt for the alternator it hitting the frame. I can’t get it out.
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Friday, July 24th, 2020 AT 4:43 PM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi,

More than likely you will need to unbolt the motor mount on that side and use a floor jack to lift the engine until it clears the frame.

There have been people that say they can jiggle it and work it out but I have never seen that. This is common on a lot of these similar cars and I am normally doing it on a lift so I just put a screw jack on it and lift the engine.

I tried to find a video of this but couldn't find one. Please let me know if you have questions about this. Thanks
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Friday, July 24th, 2020 AT 4:43 PM (Merged)
Tiny
PSYDONYM
  • MEMBER
  • 1 POST
  • 2002 INFINITI G20
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
I replaced my alternator about six months ago and after recently replacing the oxygen sensor the alternator went out. So, I replaced the alternator again about a week ago and it went out again. If I wired the oxygen sensor worng would it cause the alternator to go out or could there be something else causing the alternator to go bad?
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Friday, July 24th, 2020 AT 4:43 PM (Merged)
Tiny
MATHIASO
  • MECHANIC
  • 1,209 POSTS
Wiring the oxygen sensor wrong won't cause the alternator to go bad. but a high-wattage audio system, auxiliary lighting or other amp-hungry accessories such as megawatt amplifiers and a trunk full of subwoofers.
if you have those, you will need high output alternator from your local auto part store to handle the voltage need.
if you do not have those,check your voltage regulator look like this:


https://www.2carpros.com/forum/automotive_pictures/46384_4_3.jpg

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Friday, July 24th, 2020 AT 4:43 PM (Merged)
Tiny
MIKEESM
  • MEMBER
  • 3 POSTS
  • 2000 INFINITI G20
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 125,000 MILES
2000 Infiniti G20 125k miles when I got the car the alternator when bad, replaced it. And again 10 years and alternator goes bad, replaced it and 2 days of driving, the battery light and brake light at the dash board lighted up. Checked the alternator and was not giving charge. Checked wires electrical did not find nothing wrong. The battery is good a few months on it. Question is why the alternator go bad the new one right after the old one, and the old one did not set and lights on.
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Friday, July 24th, 2020 AT 4:43 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi mikeesm, Welcome to 2carpros and TY for the donation

You need to test the wiring to and from the alternator for shorts and opens -see wiring diagram and also test all the fuses and the charge indicator


https://www.2carpros.com/forum/automotive_pictures/12900_a1_12.jpg




https://www.2carpros.com/forum/automotive_pictures/12900_a2_11.jpg

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Friday, July 24th, 2020 AT 4:43 PM (Merged)
Tiny
MIKEESM
  • MEMBER
  • 3 POSTS
Thanks for the diagram, ill check the wiring. But if there is a short shouldn't a fuse blow and I checked the fuses, and none are bad. Also the checked if the car would be running after disconnecting the battery cable and it died so olny two days and the (new) alternator went bad. All write bad when I double check the fuses and the wiring. I placed everything back as it should go.
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Friday, July 24th, 2020 AT 4:43 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Get the alternator load tested if okay recheck the wiring as shown in the pic
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Friday, July 24th, 2020 AT 4:43 PM (Merged)
Tiny
MIKEESM
  • MEMBER
  • 3 POSTS
I load tested the alternator and it failed. Also another this I was checking the wiring the connection white and yellow/red each to ground and it was giving me almost 2volts for every wire to ground. What should the normal reading on the volt meter should be. Also double checked all fuses and there are good.
Question what reading on the meter should I be getting battery disconnected or connected both leads or one lead?
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Friday, July 24th, 2020 AT 4:43 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
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The whte wire should have battery voltage if not check fuse no.37 7.5amp in the fuse and fusible link box inear the battery, the yellow and red should read less than battery voltage bcuz irs going thru a resistor and the charge indicator bulb-also check fuse no.11 10amp in the fuse block behind dash left of steering column


https://www.2carpros.com/forum/automotive_pictures/12900_a1_13.jpg




https://www.2carpros.com/forum/automotive_pictures/12900_a2_12.jpg

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Friday, July 24th, 2020 AT 4:43 PM (Merged)
Tiny
ROBERT WHITFIELD
  • MEMBER
  • 1 POST
  • 1996 INFINITI G20
  • 4 CYL
  • 2WD
  • MANUAL
  • 185,800 MILES
If you have both wires hooked up to the battery you have 12.4 volts on the positive on the alternator. If you unhook the little white wire you only have 0.16 volts. I have checked all the fuses I can find. Also I have cleaned all the connections. Please help me. Thanks
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Friday, July 24th, 2020 AT 4:43 PM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi,

This sounds like it is normal to me. The white wire is the B+ that is coming through the fuses. Let me know what you are trying to do and we can go from there.

Here is the wiring diagram that lays this out. Thanks
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Friday, July 24th, 2020 AT 4:43 PM (Merged)
Tiny
TEODIK_M
  • MEMBER
  • 1 POST
  • 1996 INFINITI G20
  • FWD
  • AUTOMATIC
  • 128,000 MILES
I have an Infiniti G20 made in 1996, the problem is charging the battery. I have replaced the alternator but still there is a short supply. Especially when the RPM is going down, I mean when I stop the car. What else can be the problem of short electricity supply?
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Friday, July 24th, 2020 AT 4:43 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Insufficient charging voltage are mostly due to a faulty alternator. If replacement is a reman unit, I would not discount the possibility of it being bad as well.

If you have squeaking noise from drive belt area when engine is running, check the harmonic damper. When the damper is faulty, it would slip on the crank pulley and this would reduce the alternator turning rpm and a lower than expected charging rate.

Ensure belt tension is correct.
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Friday, July 24th, 2020 AT 4:43 PM (Merged)
Tiny
CLOWDER
  • MEMBER
  • 1 POST
  • 1995 INFINITI G20
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 14,000 MILES
I had this problem originally 2 yrs ago. Car started going through alternators (and of course batteries) like mad. Went through a total of 4 in two months, including two that were 'official' rebuilts from infiniti that cost and arm and a leg and another leg. No one could ever find the underlying problem, although one mentioned something about the fusible link being 'worn.' Nothing was done about it as far as I can tell. The 4th alt was an infiniti rebuild and it lasted just barely 2 years, having crapped out this week, just 2 weeks past its 2 year anniversary. So naturally I installed a new rebuilt, replaced the fusible link wire, checked the necessary fuses, charged the battery and. It ran about 10 miles. Now the alt is out and being tested to see if it managed to get totally fried during its brief life and i'm back to wondering what in the hell is causing this problem. I have looked all over the web with no luck, except to have found two other people with the EXACT SAME PROBLEM (and whose questions have also received zero answers.)
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Friday, July 24th, 2020 AT 4:43 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi clowder, Welcome to 2carpros and TY for the donation

Check all the fuses, test all the connector/wires for looseness,corrosion,opens and shorts, ground point G101connection for the alternator


https://www.2carpros.com/forum/automotive_pictures/12900_c1_54.jpg




https://www.2carpros.com/forum/automotive_pictures/12900_c2_46.jpg

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Friday, July 24th, 2020 AT 4:43 PM (Merged)
Tiny
RICHARDWADAMSON
  • MEMBER
  • 4 POSTS
  • 1995 INFINITI G20
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 143,000 MILES
MY 1995 Infiniti G20 had loose battery cables. I tightened them and charged the battery. Now it seems the Alternator is not charging could this be a possible fuse issue?
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Friday, July 24th, 2020 AT 4:43 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Check fuselink box next gto battery fuseA-D
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Friday, July 24th, 2020 AT 4:44 PM (Merged)

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