Go Back   Ford Mustang Forums > Mustang > 4.6 Mustang > 4.6L Tech

Welcome to our Mustang forums where Mustangers come together to hang out, discuss and enjoy their favorite Mustang hobby with fellow Mustang enthusiasts. We invite everyone to read, post, and enjoy our Mustang forum as well as the many other sections of our site.

You are currently viewing our forums as a guest. By joining our community you gain access to post topics, communicate with members, upload your photos and access many other special features. Registration is fast, simple and free so why wait, join our Mustang community today! If you have any problems with registration or your account login, please contact support.


Reply   Post New Thread
Unread 11-16-2012   #1 (permalink)
money_pitt2 is offline Rookie


Joined: Oct 2012
Posts: 1 Threads: 1
 money_pitt2's Country Flag
NORTH East ga   Georgia
money_pitt2 is on a distinguished road
Unhappy 1998 Mustang Gt cannot get alt to work

i have a 98 gt and i cannot get my alternator to work for more than maybe 3 miles.
I bought the car 8 months ago and it never read past the R of NORMAL, but car started right up no light surging, power loss, or anything then one day car just dies i figure ok alt went out. So i buy a new battery and alternator and install car runs fine but still dosent rise above R so i started replacing some of alt wires no luck there. Took old alt and battery had both tested both were fine, battery was dead but had it charged and installed in different car it does fine. now my car has started acting up again and ive tried battery and alt again and some wires but after 2 or 3 miles gauge drops off and car starts to die. no battery light had everything tested and its all fine but im loosing my mind with this please help
money_pitt2 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Unread 11-17-2012   #2 (permalink)
Tominator is offline GT Member

5.0L Member


Joined: Nov 2003
Posts: 2,423 Threads: 103
 Tominator's Country Flag  View Tominator's 39 photos
Cahokia   Illinois
Tominator is on a distinguished road
Default

OK, if you get no alternator light that might just be the problem or at least the clue on how to fix it. The alternator light bulb provides resistance and triggers the alternator's voltage regulator to sense load.
On the circuit board the bulb mounts to is a resistor. If the bulb goes out the resistor acts as backup if the bulb burns out. Rarely do both go out.

Does the alternator light come on with the key in the on position? If it does then we can probably look elsewhere.

The wire on the alternator that goes to the bulb/resistor is green/whit stripe if I'm not mistaken.

:youwelcome::youwelcome:
__________________
'95 Ranger 5.0 GT40X Tri-y GT40 Intake S-Trim Snow Stage 2 Lowered Baer Racing Brakes Viper Spec Tremec w/Hurst shifter Custom Interior Dakota Digital Dash Corbeau Toplines OZ Racing AM/FM/Mp3/CD/DVD/TV.

2014 GTIG 5.0 Vert.

1989 GT in need of Resto

1996 F150 Eddie Bauer. 351 and mods. Lifted...33's..10MPG!!!
Tominator is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 11-17-2012   #3 (permalink)
wmburns is offline BOSS Member


Joined: Sep 2010
Posts: 4,878 Threads: 0
 wmburns's Country Flag
Houston   Texas
wmburns is a jewel in the roughwmburns is a jewel in the roughwmburns is a jewel in the roughwmburns is a jewel in the rough
Default

+1 on above.

Just wondering if you have checked the fuses in the engine bay and driver's kick panel? For example the "ALT" fuse in the engine bay and I/P Fuse #18.

Since this is a "new to you" car, confirm that the grounding strap is in place between the left hand motor mount and the frame rail. It should be a bare braided line. Also check the battery terminals and the grounds around the radiator core support. Are they clean and tight?

Are you positive the correct alternator for your application has been used? There are differences between some Ford products in the alternator's internal wiring.

To the small alternator plug should have two wires (Y/W and LG/R) verify that the W/BK jumper is in place.

Confirm that the fusible link is good. Disconnect the alternator's main B+ terminal. Confirm there is +12 volts on the line. If not, suspect a bad fusible link.

The wire that goes to the alternator charge warning light is LG/R for the 1998 model year.
__________________
2003 GT Convertible (sold)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
wmburns is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Reply   Post New Thread



Thread Tools



Mustang Photos
Mustang Links    Top Sites    RSS    Link To Us    Add to Favorites    Archive    Terms of Use    Site Rules    Privacy    Contact    Sponsors    Advertise   
AllFordMustangs is not affiliated with or endorsed by Ford Motor Company. ©Copyright 2002-2011 All Auto Enthusiasts Network

Search Engine Friendly URLs by vBSEO 3.5.2

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171