Do You Need To Run A Bigger Alternator With U/D Pullies?

Tony_90fox · October 27th, 2006, 05:04 PM

I had this problem when i first put my pullies on my car. it was a little hesitant to start. now i havent driven the car in about a week and the thing wont even turn over. what could be the problem?
Not really for sure, but maybe i left something on, but my headlights were not on. I dont know the problem but it wouldnt start as soon as i put them on either. then it ran everytime. now back to not running.

I am getting a jump in 20 mins, hope that helps.

OTreborO · October 27th, 2006, 05:15 PM

Originally Posted by Tony_90fox

I had this problem when i first put my pullies on my car. it was a little hesitant to start. now i havent driven the car in about a week and the thing wont even turn over. what could be the problem?
Not really for sure, but maybe i left something on, but my headlights were not on. I dont know the problem but it wouldnt start as soon as i put them on either. then it ran everytime. now back to not running.

I am getting a jump in 20 mins, hope that helps.

I have not heard of anyone having a problem. I would want more info before suggesting a possible fix:

What do you mean hesitant to start, and what do you mean would not start?

Did it turn over at all? How many otions do you have? Large amp? Fog Lamps. Ohms Law Voltage = current X Resistance :-)

Have you had the Alt checked at a repair shop? Not a parts store, but a repair shop please

mdvaldosta · October 27th, 2006, 05:26 PM

If you've got a big stereo system or other electronics, and do alot of sitting at stoplights, you may have a problem. Other than that, you should be fine. When driving, there really won't be a difference in battery charging over the stock pulleys.

GTsetGO · October 27th, 2006, 05:56 PM

i have had mine on for two years and have had no problem. Then again, I still have the stock stereo and all.

5-0stank · October 27th, 2006, 11:11 PM

the underdrive shouldnt be a problem...maybe your battery is just that weak???

Darrell · October 28th, 2006, 12:59 AM

Underdrive pullies are not the cause. You need to check for a draw in the system. You could also have a bad alternator or battery.

stang fanatic · October 28th, 2006, 12:03 PM

load test the batt AND test the alternator for its output. SHould be no less than 15% of its rated output. Internally shorted or weak batts are good trroblemakers for frying alternators, so be sure to ck both

Tony_90fox · October 28th, 2006, 03:22 PM

okay guys thanks, sorry so long for a resonse but i got a new battery and i think that it is fine now. i got a jump yesterday. the car started but then when i stpped for gas. the car wouldnt start. the car wasnt holding a charge. i bought a new battery and i think that it is fine now. thanks for the replies

OTreborO · October 28th, 2006, 07:37 PM

Originally Posted by Tony_90fox

okay guys thanks, sorry so long for a resonse but i got a new battery and i think that it is fine now. i got a jump yesterday. the car started but then when i stpped for gas. the car wouldnt start. the car wasnt holding a charge. i bought a new battery and i think that it is fine now. thanks for the replies

check your alt or you may be buying a new battery in a few months, and also a alternator.

Tony_90fox · October 28th, 2006, 08:34 PM

cool, with the new battery, i will also buy a new alt too.

stang fanatic · October 29th, 2006, 12:27 PM

test it first, dont just throw money to replace it if its good...

91GRNGT · October 29th, 2006, 12:37 PM

yeah Tony, believe me i throw away money like that and then regret it later lol.. Sorry i haven't gotten back with you on the seats man, but right now I can't get them, If u by some chance hang on to them i can maybe pay ya so much a week or something.. Thanks man.. and I hope u got your car fixed, I had to put a window in mine lol, bad deal don't ask lol..

89StangGT · October 29th, 2006, 07:20 PM

my car was doing the same thing for a while it would start hard or if i let it sit for a couple days it would be completely dead. for weeks i couldnt figure out what it was, and then one night a buddy and me were sitting in it while it was shut off, with the doors closed wondering what could cause it, and we noticed a glowing from the visors, pulled them down and the plastic cover that goes over the mirror wasnt pushing the switch in for the mirror light, so both mirrors were staying on all the time, and as soon as i took care of those i havnt had a problem since.

Tony_90fox · October 29th, 2006, 08:57 PM

hey man, swear, mine does the same thing on the drivers side. Can i just cut the wires or something? I dont use the light anyway. What did you do man?

5.0guy · October 29th, 2006, 10:01 PM

just so you know i went to the junk yard and upgraded my altenator from the factory 70 amp to a 130 amp for like $25 all you have to do is get a altenator of a 3.0 liter taurus and shave a little off your alt bracket.

Tony_90fox · October 30th, 2006, 01:00 AM

cool man thanks, i was thinking of the 130 amp anyway because i will be running an electric fan in a couple weeks. thanks for the replies.

5-0stank · October 30th, 2006, 03:09 PM

anyone know what the factory 1995 5.0 alternator is rated at?

Tony_90fox · October 30th, 2006, 05:31 PM

Originally Posted by 91GRNGT

yeah Tony, believe me i throw away money like that and then regret it later lol.. Sorry i haven't gotten back with you on the seats man, but right now I can't get them, If u by some chance hang on to them i can maybe pay ya so much a week or something.. Thanks man.. and I hope u got your car fixed, I had to put a window in mine lol, bad deal don't ask lol..

hey man thats cool, i will just put the rear seats away for awhile, unless any of you guys want some excellent condition seats out of a 90 5.0 lx.

Tony_90fox · October 30th, 2006, 05:31 PM

Originally Posted by 5-0stank

anyone know what the factory 1995 5.0 alternator is rated at?

probably 70-80, but dont quote me.

mikebert · November 29th, 2006, 03:14 PM

A bigger alternator can't hurt but an easy solution is to get a smaller pulley for the alternator to compensate for the underdrive pulleys.

October 27th, 2006, 05:04 PM	#1
Tony_90fox On Probation Join Date: Jun 2006 Location: Bowling Green, KY Posts: 3,793	Do You Need To Run A Bigger Alternator With U/D Pullies? I had this problem when i first put my pullies on my car. it was a little hesitant to start. now i havent driven the car in about a week and the thing wont even turn over. what could be the problem? Not really for sure, but maybe i left something on, but my headlights were not on. I dont know the problem but it wouldnt start as soon as i put them on either. then it ran everytime. now back to not running. I am getting a jump in 20 mins, hope that helps.

October 27th, 2006, 05:56 PM	#4
GTsetGO SoMuchCoolerThanChiaGutt 2004 Mustang GT 12.88 @ 112 Join Date: Aug 2005 Location: Newport News, VA Posts: 7,803	i have had mine on for two years and have had no problem. Then again, I still have the stock stereo and all. __________________ Have a WHITE99 kind of day. Gun Fans Click Here A hard-on doesn't count as personal growth.

October 27th, 2006, 11:11 PM	#5
5-0stank Enthusiast Join Date: Sep 2006 Location: emmaus, pa Posts: 508	the underdrive shouldnt be a problem...maybe your battery is just that weak??? __________________ 1995 GT::Sold! Looking for another stang...

October 28th, 2006, 12:59 AM	#6
Darrell Asshole™ 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: Fond du Lac, Wisconsin Posts: 7,762	Underdrive pullies are not the cause. You need to check for a draw in the system. You could also have a bad alternator or battery. __________________ Racing in memory of Dave Bandt 11/19/69 - 3/23/08 "he's traded his wheels for wings" Professor of Natural Aspiration Thanks to: Artie at Trick Flow, Dave at Team Z Motorsports, Brian at Total Engine Airflow and Harold at Furo Racecraft

October 28th, 2006, 12:03 PM	#7
stang fanatic Enthusiast Join Date: May 2006 Location: El Paso, Tx Posts: 855	load test the batt AND test the alternator for its output. SHould be no less than 15% of its rated output. Internally shorted or weak batts are good trroblemakers for frying alternators, so be sure to ck both __________________ "The gods too are fond of a joke." "If I had only known, I would have been a locksmith. "

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October 27th, 2006, 05:26 PM	#3
mdvaldosta Maintenance Man 2002 Mustang GT 11.47@120.58 Join Date: Aug 2005 Location: Valdosta, GA Posts: 3,943	If you've got a big stereo system or other electronics, and do alot of sitting at stoplights, you may have a problem. Other than that, you should be fine. When driving, there really won't be a difference in battery charging over the stock pulleys.

October 29th, 2006, 12:27 PM	#11
stang fanatic Enthusiast Join Date: May 2006 Location: El Paso, Tx Posts: 855	test it first, dont just throw money to replace it if its good... __________________ "The gods too are fond of a joke." "If I had only known, I would have been a locksmith. "

October 29th, 2006, 12:37 PM	#12
91GRNGT Regular Join Date: Oct 2006 Location: Cohutta,ga Posts: 118	yeah Tony, believe me i throw away money like that and then regret it later lol.. Sorry i haven't gotten back with you on the seats man, but right now I can't get them, If u by some chance hang on to them i can maybe pay ya so much a week or something.. Thanks man.. and I hope u got your car fixed, I had to put a window in mine lol, bad deal don't ask lol.. __________________ 1991 Mustang GT 306, with KB .30 over pistons, steeda #18 cam! 05 Dodge Neon "Daily driver" Does dodge and ford match??? http://i67.photobucket.com/albums/h2...sswithdock.jpg

October 29th, 2006, 07:20 PM	#13
89StangGT Moderator Join Date: Aug 2006 Location: Toledo Ohio Posts: 1,035	my car was doing the same thing for a while it would start hard or if i let it sit for a couple days it would be completely dead. for weeks i couldnt figure out what it was, and then one night a buddy and me were sitting in it while it was shut off, with the doors closed wondering what could cause it, and we noticed a glowing from the visors, pulled them down and the plastic cover that goes over the mirror wasnt pushing the switch in for the mirror light, so both mirrors were staying on all the time, and as soon as i took care of those i havnt had a problem since. __________________ 2004 SVT Cobra 2000 LS1 Camaro

October 29th, 2006, 10:01 PM	#15
5.0guy Regular 1990 foxbody 14.8@98mph Join Date: Oct 2006 Location: archer,fl Posts: 60	just so you know i went to the junk yard and upgraded my altenator from the factory 70 amp to a 130 amp for like $25 all you have to do is get a altenator of a 3.0 liter taurus and shave a little off your alt bracket. __________________ your always faster then the guy in the mirror

October 30th, 2006, 03:09 PM	#17
5-0stank Enthusiast Join Date: Sep 2006 Location: emmaus, pa Posts: 508	anyone know what the factory 1995 5.0 alternator is rated at? __________________ 1995 GT::Sold! Looking for another stang...

November 29th, 2006, 03:14 PM	#20
mikebert Enthusiast Join Date: Oct 2006 Location: Augusta, GA Posts: 906	A bigger alternator can't hurt but an easy solution is to get a smaller pulley for the alternator to compensate for the underdrive pulleys.

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Do You Need To Run A Bigger Alternator With U/D Pullies?

Do You Need To Run A Bigger Alternator With U/D Pullies?

Re: do you need to run a bigger altenator with u/d/pullies?