Alternator From Hell

RMARIANI · 01-04-2001, 02:54 PM

I replaced my alternator (89'G.T) last week. Ran fine for a few days. Now my AMP light goes on and my gauge shows that my new battery is draining. Its also making a combination grinding and whistling noise. Did I just get a bad alternator. The install wasn't brain surgey. I can't think of anything I could have done wrong. Thanks.

[This message has been edited by RMARIANI (edited 01-04-2001).]

01-04-2001, 02:57 PM

I bet it is a defective alternator.

------------------
67 Fastback - Arctic White Pearl paint
351W ,Trick Flow Aluminum Heads, Edelbrock TorkerII, Comp. Cam, Performance Automatic C-4 Trans, 3.55 gears, Front Disc Brakes, 1-1/8" Fr. 3/4" rear sway bars.

My 351W Fastback

RMARIANI · 01-04-2001, 02:58 PM

Yeah, that's what I'm hoping. Can't think of what else it could be.

Tom351 · 01-04-2001, 03:07 PM

I used to work at Napa in high school, and we had a lot of alternators come back bad.

------------------
67 Fastback - Arctic White Pearl paint
351W ,Trick Flow Aluminum Heads, Edelbrock TorkerII, Comp. Cam, Performance Automatic C-4 Trans, 3.55 gears, Front Disc Brakes, 1-1/8" Fr. 3/4" rear sway bars.

My 351W Fastback

Jaydee · 01-04-2001, 03:09 PM

Bad alternator's out of the box especially "rebuilt" ones, are not uncommon I bet I have had at least a dozen bad ones over the years - try another one and you will probably be fine

RMARIANI · 01-04-2001, 03:19 PM

Thanks for the confidence boost guys. I'll let you know what happens.

SmokeyDP · 01-04-2001, 06:16 PM

Did you try kicking it?...that usually works for me

No, but seriously, if its making funny noises it must just be bad. I just replaced the stock one in my 92GT for a 130AMP from a 94 I found on ebay and since then my amps are fine.

------------------
1992 GT 5.0L Convertible
BBK Shorties
All Power
Super Chip
Mass Air

LX XLR8R · 01-05-2001, 02:56 PM

yea when you get a new one ask for a AOD one..they will swap right in(just have them rotate the back casing 4 u) and they are 10 more amps..or just do what i did and get a 130amp 3g..easy swap

------------------
1987 black notch(ex 4 banger)
DSS 306 w/ main support...Elderbrock 6028 heads..gt-40 intake..24# injectors...70 mm tb..77 pro-m...accel 300+..mac full legnth..tremec w/ pro5oh...full MAC exhaust,off road h-pipe,long tubes, catback...ron davis radiator..subframes, control arms...CFDF II..o yea holley FPR sucks..dont buy one..

01-04-2001, 02:54 PM	#1
RMARIANI Registered Member Join Date: Apr 2000 Location: New Jersey Posts: 167	Alternator From Hell I replaced my alternator (89'G.T) last week. Ran fine for a few days. Now my AMP light goes on and my gauge shows that my new battery is draining. Its also making a combination grinding and whistling noise. Did I just get a bad alternator. The install wasn't brain surgey. I can't think of anything I could have done wrong. Thanks. [This message has been edited by RMARIANI (edited 01-04-2001).]

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01-04-2001, 02:57 PM	#2
tom351 Guest Posts: n/a	I bet it is a defective alternator. ------------------ 67 Fastback - Arctic White Pearl paint 351W ,Trick Flow Aluminum Heads, Edelbrock TorkerII, Comp. Cam, Performance Automatic C-4 Trans, 3.55 gears, Front Disc Brakes, 1-1/8" Fr. 3/4" rear sway bars. My 351W Fastback

01-04-2001, 02:58 PM	#3
RMARIANI Registered Member Join Date: Apr 2000 Location: New Jersey Posts: 167	Yeah, that's what I'm hoping. Can't think of what else it could be.

01-04-2001, 03:07 PM	#4
Tom351 Registered Member Join Date: Oct 2000 Location: Atlanta,GA,USA Posts: 278	I used to work at Napa in high school, and we had a lot of alternators come back bad. ------------------ 67 Fastback - Arctic White Pearl paint 351W ,Trick Flow Aluminum Heads, Edelbrock TorkerII, Comp. Cam, Performance Automatic C-4 Trans, 3.55 gears, Front Disc Brakes, 1-1/8" Fr. 3/4" rear sway bars. My 351W Fastback

01-04-2001, 03:09 PM	#5
Jaydee Registered Member Join Date: Sep 2000 Location: Conn. Posts: 220	Bad alternator's out of the box especially "rebuilt" ones, are not uncommon I bet I have had at least a dozen bad ones over the years - try another one and you will probably be fine

01-04-2001, 03:19 PM	#6
RMARIANI Registered Member Join Date: Apr 2000 Location: New Jersey Posts: 167	Thanks for the confidence boost guys. I'll let you know what happens.

01-04-2001, 06:16 PM	#7
SmokeyDP Registered Member Join Date: Jun 1999 Location: Middlesex, NJ Posts: 212	Did you try kicking it?...that usually works for me No, but seriously, if its making funny noises it must just be bad. I just replaced the stock one in my 92GT for a 130AMP from a 94 I found on ebay and since then my amps are fine. ------------------ 1992 GT 5.0L Convertible BBK Shorties All Power Super Chip Mass Air

01-05-2001, 02:56 PM	#8
LX XLR8R Dirk Diggler Join Date: Feb 1999 Location: SLOATSBURG, NY Posts: 1,931	yea when you get a new one ask for a AOD one..they will swap right in(just have them rotate the back casing 4 u) and they are 10 more amps..or just do what i did and get a 130amp 3g..easy swap ------------------ 1987 black notch(ex 4 banger) DSS 306 w/ main support...Elderbrock 6028 heads..gt-40 intake..24# injectors...70 mm tb..77 pro-m...accel 300+..mac full legnth..tremec w/ pro5oh...full MAC exhaust,off road h-pipe,long tubes, catback...ron davis radiator..subframes, control arms...CFDF II..o yea holley FPR sucks..dont buy one..