Why wont or cant anyone seem to help my problem? - Mustang Evolution

Go Back   Mustang Evolution > 1979-2015 Mustang GT || Tech and Talk > 1996-2004 Mustang GT



Reply
 
Thread Tools Search this Thread
Please support our sponsors and let them know you heard about them here!
Old 04-05-2013, 06:40 PM   #1
Registered Member
Regular
 
OneSlow96's Avatar
 
Join Date: Mar 2013
Location: Long island
Region: New York
Posts: 34
Why wont or cant anyone seem to help my problem?

I am having a voltage problem when the car is brought above 3k rpm it drops about half of normal running. The alternator is a year old and i know there is such things of defects but i had the wiring checked and the alternator. Any ideas at all.
OneSlow96 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 04-05-2013, 07:30 PM   #2
Registered Member
Regular
 
1996mustang's Avatar
 
Join Date: Jun 2012
Location: Miami
Region: Florida
Posts: 1,013
Get the alternator checked out even if its a year old. Autozone pepboys normally do free alty tests. And when you go above 3 k rpms it goes down half normal by saying that what do you mean exactly. Trying to get more details so all of us can help a brother/sister in need with his/her car.

---------- Post added at 08:30 PM ---------- Previous post was at 08:28 PM ----------

I did just read that you had it checked out but by who exactly. Anothee thing could be something taking a load that could cause a drop in voltage like the ac being on or the fans kicking in around that rpm.
__________________
1996 Mustang GT, 17x9 front and 17x10.5 cobra r replica rims, 255/40/17 front 285/40/17 rear at the moment,
o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
1996mustang is offline   Reply With Quote
Old 04-05-2013, 08:10 PM   #3
Registered Member
Regular
 
OneSlow96's Avatar
 
Join Date: Mar 2013
Location: Long island
Region: New York
Posts: 34
No because autozone bench tested it. Was fine and not that because i can be in park and rev the motor and the same happens even when not under a load. Driving me nuts.

---------- Post added at 07:10 PM ---------- Previous post was at 07:07 PM ----------

The stock voltage is at half way between 8 and 18 but when revved it drops a lil above 8 i would say about 10 or 11 volts
OneSlow96 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 04-05-2013, 08:21 PM   #4
Registered Member
Regular
 
1996mustang's Avatar
 
Join Date: Jun 2012
Location: Miami
Region: Florida
Posts: 1,013
Ac on or off? Its odd if at 3k it starts doin it unless its the fuel pump drawing alot at that rpm then maybe the pump could be the culprit. Any accessories on? And did it start happening after u did some work on the car or jusg out if random and has it affected drivability and if so how
__________________
1996 Mustang GT, 17x9 front and 17x10.5 cobra r replica rims, 255/40/17 front 285/40/17 rear at the moment,
o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
1996mustang is offline   Reply With Quote
Old 04-05-2013, 08:25 PM   #5
Registered Member
Regular
 
cliffyk's Avatar
 
Join Date: Oct 2012
Region: Florida
Posts: 1,001
Quote:
Originally Posted by OneSlow96 View Post
No because autozone bench tested it. Was fine and not that because i can be in park and rev the motor and the same happens even when not under a load. Driving me nuts.

---------- Post added at 07:10 PM ---------- Previous post was at 07:07 PM ----------

The stock voltage is at half way between 8 and 18 but when revved it drops a lil above 8 i would say about 10 or 11 volts
The generator or wiring are bad. The most likely being a bad ground connection, though it could be the + feed between the generator and the battery.

You need to check the voltage drop between the generator output terminal and the battery + terminal, and the drop between the generator body and the battery negative terminal--these should both be no more than 0.5V. To do this using a digital multimeter place one probe on the generator output and one on the battery + post; and then one probe on the generator body and the negative post.

The primary ground strap for the engine block runs from the battery to the block just behind the oil filter adapter, it is not uncommon for that connection at the block to corrode or come loose--check it first...
__________________
SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
cliffyk is offline   Reply With Quote
Old 04-05-2013, 08:33 PM   #6
Registered Member
Regular
 
jdavis96gt's Avatar
 
Join Date: Mar 2012
Region: West Virgina
Posts: 1,014
I would try resetting computer.(unhooking battery)
jdavis96gt is offline   Reply With Quote
Old 04-05-2013, 08:34 PM   #7
Registered Member
Regular
 
Tyoung68's Avatar
 
Join Date: Jun 2011
Location: concord
Region: California
Posts: 3,475
Check grounds and all connections are good
Tyoung68 is offline   Reply With Quote
Old 04-06-2013, 12:18 AM   #8
Registered Member
Regular
 
OneSlow96's Avatar
 
Join Date: Mar 2013
Location: Long island
Region: New York
Posts: 34
Quote:
Originally Posted by 1996mustang View Post
Ac on or off? Its odd if at 3k it starts doin it unless its the fuel pump drawing alot at that rpm then maybe the pump could be the culprit. Any accessories on? And did it start happening after u did some work on the car or jusg out if random and has it affected drivability and if so how
I do have a walburro 315 fuel pump actually and acc nothing much full msd,blaster coil, nitrous set up, gauges six of them and its 50 degrees out lmao no ac yet. Its a fully built stroker motor setup internally balanced the whole 9 yard you know. But yes after all the work. Think i need to add a bigger alternator to the car?

---------- Post added at 11:18 PM ---------- Previous post was at 11:16 PM ----------

ThAnk you guys will check all possible things then if i get nowhere i will have to go with a bigger alternator.
OneSlow96 is offline   Reply With Quote
Old 04-06-2013, 02:24 AM   #9
Registered Member
Regular
Supporter
 
93slowstang's Avatar
 
Join Date: Jan 2011
Location: Walker
Region: Louisiana
Posts: 3,436
It may just be the voltage regulator. They can cause your symptoms and still test ok.
__________________


93 GT with more junkyard mods than you can imagine.
90 GT bone stock down to the air filter, awaiting restoration.
Join Mustang Evolution today. Click here
93slowstang is offline   Reply With Quote
Old 04-06-2013, 02:37 AM   #10
Registered Member
Regular
 
Tyoung68's Avatar
 
Join Date: Jun 2011
Location: concord
Region: California
Posts: 3,475
Quote:
Originally Posted by 93slowstang View Post
It may just be the voltage regulator. They can cause your symptoms and still test ok.
+1 i thought that too. If you rev your engine when its ok park and the lights get brighter then your regulator is bad
Tyoung68 is offline   Reply With Quote
Old 04-06-2013, 09:45 AM   #11
Registered Member
Regular
 
cliffyk's Avatar
 
Join Date: Oct 2012
Region: Florida
Posts: 1,001
If you go to my website (click here), and use the sidebar menu to select Shop Manual Docs|Electrical|Charging System (see below) you can get the system tests and diagnostics for the charging system:



Charging is not controlled by the PCM as with some other Ford models, it is a standalone system independent of the PCM.

The starting system diagram can also be downloaded from that same menu.
__________________
SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
cliffyk is offline   Reply With Quote
Old 04-06-2013, 10:36 AM   #12
Registered Member
Regular
 
1996mustang's Avatar
 
Join Date: Jun 2012
Location: Miami
Region: Florida
Posts: 1,013
So it might be u need a bigger alty like a 140 amp if you got all those goodies. Well atleast we are making some progress in whats going on with your car
__________________
1996 Mustang GT, 17x9 front and 17x10.5 cobra r replica rims, 255/40/17 front 285/40/17 rear at the moment,
o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
1996mustang is offline   Reply With Quote
Reply

Lower Navigation
Go Back   Mustang Evolution > 1979-2015 Mustang GT || Tech and Talk > 1996-2004 Mustang GT

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


» Like Us On Facebook



03:03 PM


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0

MustangEvolution.com is in no way associated with or endorsed by Ford Motor Company.