3rd Generation Specific (1993-2002) 1993-2002 Discussion including performance modifications and Technical Support Sections.
Sponsored by:

Possible bad alternator, need 2nd opinion

Thread Tools
 
Search this Thread
 
Old 05-24-09, 06:44 PM
  #1  
¿¿What are pistons??

Thread Starter
iTrader: (7)
 
2RotorsNaDream's Avatar
 
Join Date: May 2003
Location: Queens NYC
Posts: 1,261
Likes: 0
Received 0 Likes on 0 Posts
Possible bad alternator, need 2nd opinion

OK a while ago my brake light started lighting up, whenever I floor the car it would go away. I took this as one of the first signs the alternator was going bad. Now last night the car would not start up. I got a jump and it started and I was on my way. Today again the car wont start so I get it jumped and leave it idling for about 20 minutes, turn the car off and try to start it again right away and absolutely nothing again. The battery is about a month old, the starter is clicking so I'm assuming its the alternator but wouldnt the car turn off after a few minutes of idling if it was? I'm looking for second opinions but I'm pretty sure its the alternator. And anyone got suggestions on where to get a good alternator at? I know AutoZone has lifetime warranties on them but I also heard you'll be using the warranty quite often if you get it from them. Any help is really appreciated, thanks alot.
Old 05-24-09, 06:55 PM
  #2  
Full Member

 
HawaiianRedMako's Avatar
 
Join Date: Dec 2006
Location: Oahu
Posts: 221
Likes: 0
Received 0 Likes on 0 Posts
HI

Originally Posted by 2RotorsNaDream
OK a while ago my brake light started lighting up, whenever I floor the car it would go away. I took this as one of the first signs the alternator was going bad. Now last night the car would not start up. I got a jump and it started and I was on my way. Today again the car wont start so I get it jumped and leave it idling for about 20 minutes, turn the car off and try to start it again right away and absolutely nothing again. The battery is about a month old, the starter is clicking so I'm assuming its the alternator but wouldnt the car turn off after a few minutes of idling if it was? I'm looking for second opinions but I'm pretty sure its the alternator. And anyone got suggestions on where to get a good alternator at? I know AutoZone has lifetime warranties on them but I also heard you'll be using the warranty quite often if you get it from them. Any help is really appreciated, thanks alot.
Probe the battery terminals with a (VOM) Volt Ohm Meter set at DC volts, set it at 20 DC volts, the battery should read at least 12 volts. Start the FD and again probe the battery, it should at least read 14 volts if the alternator is charging.

If not, try to "jiggle" the terminal at the alternator, sometimes it gets loose and see if the VOM DC level "jumps". If still no reading above the static battery level of 12 volts, then most likely the alternator is shot.

There are places that do rewound the alternator if you don't want to spend that hard earned cash on a new one. Good luck
Old 05-24-09, 06:57 PM
  #3  
14K miles in 2 weeks

iTrader: (2)
 
wilson94T's Avatar
 
Join Date: Aug 2003
Location: Bay Area, CA
Posts: 64
Received 2 Likes on 1 Post
Originally Posted by 2RotorsNaDream
OK a while ago my brake light started lighting up, whenever I floor the car it would go away. I took this as one of the first signs the alternator was going bad. Now last night the car would not start up. I got a jump and it started and I was on my way. Today again the car wont start so I get it jumped and leave it idling for about 20 minutes, turn the car off and try to start it again right away and absolutely nothing again. The battery is about a month old, the starter is clicking so I'm assuming its the alternator but wouldnt the car turn off after a few minutes of idling if it was? I'm looking for second opinions but I'm pretty sure its the alternator. And anyone got suggestions on where to get a good alternator at? I know AutoZone has lifetime warranties on them but I also heard you'll be using the warranty quite often if you get it from them. Any help is really appreciated, thanks alot.
One way is to put a meter on the car to load test the alternator. if that shows the alternator is bad, you have two things to consider.

1. you can buy (or borrow) a new alterntor and see if this resolves the problem.

2. If you have done any modifications to the car recently, (like changing the oil coolers, or removing the PS pump) you'll want to verify that you have not compromised any grounding in the car. The alternator will not charge the battery correctly if the main harnes is not properly grounded. There is a bracket that holds the stock oil cooler lines and also holds the main ground for the wire harnes. I've seen situations where that was not properly reattached and a grounding issue made it look like an alternator was requried.

Basically, if you're alternator doesn't increase beyond say, 30amps, then you've a situatino where the unit is either bad, or the trigger to tell it to up the power is not being flipped. If it's the latter, that can be a ground.

Changing the altnernator can be done very quickly. If you have a friend with a 3rd gen near by, you might as well try that.
Old 05-24-09, 07:57 PM
  #4  
Sponsor
iTrader: (41)
 
IRPerformance's Avatar
 
Join Date: Apr 2003
Location: NJ
Posts: 11,347
Received 317 Likes on 190 Posts
If you need it rebuilt I can do my 140 amp upgrade for you. They work real well in these cars.
Old 05-24-09, 09:13 PM
  #5  
Manly
 
Snowblind113's Avatar
 
Join Date: Mar 2008
Location: Toms River, NJ
Posts: 146
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Rotary Experiment Seven
If you need it rebuilt I can do my 140 amp upgrade for you. They work real well in these cars.
How much does the upgrade cost? Possibly interested
Old 05-24-09, 09:23 PM
  #6  
Irregular Here

iTrader: (14)
 
7dust's Avatar
 
Join Date: Dec 2003
Location: Alvin, TX
Posts: 3,075
Likes: 0
Received 4 Likes on 4 Posts
You mentioned Auto Zone.

The Auto Zone by my house does free alternator testing. I pulled my alternator off a while back when I suspected it was going south.

I took it to Auto Zone and they put it on their machine. I could hear the alternator whining (which was impossible to hear while it was on the car running). The alternator failed. I had a spare alternator and they tested it too. It passed and I swapped them out. No problem after that.
Old 05-27-09, 02:17 AM
  #7  
T-bird painter

 
flyboyjuge's Avatar
 
Join Date: Feb 2003
Location: nellis airforce base, las vegas
Posts: 827
Likes: 0
Received 0 Likes on 0 Posts
I usually check an alternator by starting the car and sticking a socket on the back, it should stick to it if its doing what its supposed to. Also you can buy a alternator rebuild kit for around 20 bucks. It is very simple to rebuild. The brushes inside may be worn down.
Old 05-27-09, 07:16 AM
  #8  
Full Member

 
roland88's Avatar
 
Join Date: Mar 2002
Location: Sydney, Australia
Posts: 59
Likes: 0
Received 0 Likes on 0 Posts
I got a new alternator today. All my warning lights started to come on. As mentioned, make sure your terminals are tight - meter the battery (or "B" on the alternator). Should be 12.2V or there abouts before ignition. Should be 14.4V at idle, my old one went to 14V on initial idle, then slowly dropped to 12.2V - probably the regulator within the alternator.

I didn't find it a quick and easy job to replace it, since I didn't want to disassemble too much - had a heap of trouble trying to jiggle it in and out of between the inlet and turbo pipes - and getting the belt back on was a bitch.

I didn't muck around with repairs, just got a nice shiny new one from here: http://www.baxters.com.au/index.php?...tails&id=12746
Old 05-27-09, 07:52 AM
  #9  
ERTW

iTrader: (4)
 
rd_turbo's Avatar
 
Join Date: Oct 2004
Location: Mississauga, ON
Posts: 810
Likes: 0
Received 0 Likes on 0 Posts
When replacing your alternator, check the wires at the large connector at the back. There are a lot of FDs out there with crispy and often cracked wires there just itching to touch each other.
Old 05-27-09, 10:23 AM
  #10  
¿¿What are pistons??

Thread Starter
iTrader: (7)
 
2RotorsNaDream's Avatar
 
Join Date: May 2003
Location: Queens NYC
Posts: 1,261
Likes: 0
Received 0 Likes on 0 Posts
It ended up being the brand new battery. Everything was good when I checked the alternator so I borrowed a battery, started right up after. Now the place I bought the battery from wont return it because its been 36 days and their return policy is 30 days, so I gotta go through the battery companys warranty dept.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Jeff20B
1st Generation Specific (1979-1985)
73
09-16-18 07:16 PM
blackball7
2nd Generation Specific (1986-1992)
34
09-16-15 10:10 AM
mulcryant
2nd Generation Specific (1986-1992)
10
09-09-15 05:24 PM
Murilli
Midwest RX-7 Forum
0
09-03-15 09:10 AM



Quick Reply: Possible bad alternator, need 2nd opinion



All times are GMT -5. The time now is 07:35 PM.