alternator questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cliffsta · 10-04-2004, 06:39 PM

OK, my batttery is toast, stick a fork in it. It barely makes 11 volts while driving. Idling at stoplights it falls down around 9 volts. How can i check my alternator to see if it is also going south? I know its getting heavy use because of the terminal battery that is running lights, radio, and windshield wipers.
This leads to my next question. Shortly after starting it, there is this god awful ghostly sounding whail coming from the passenger side of the truck. And after i turn the truck off, there is a fast tick tick tick noise coming from the same area that slowly dies away. I honestly don't know exactly where the alternator is, but since the battery is on the right, im assuming the alternator is over there too. The belt worn maybe? Pully worn? Any ideas are welcome.
Cliff

Russell · 10-04-2004, 06:56 PM

Sounds like your alternator is fried to me... Probally took your battery with it

hotrodhomi · 10-04-2004, 06:59 PM

take your volt meter and measure at the back of the alt. It should read 13.5 volts +/-

cliffsta · 10-04-2004, 07:10 PM

thanks guys! I'll go check that after supper. if my alternator is bad, can i bring the core into Autozone or who ever and get a replacement for little?

hotrodhomi · 10-04-2004, 07:22 PM

should be ~60 bucks... they can also check it for you. dont install your new alt with a dead battery.. you may get away with it, but you run the chance of burning the alt up. do you have a hydrometer to test the battery cells?

cliffsta · 10-04-2004, 08:21 PM

nah i don't but the battery is my mom's van died a few months ago and we changed both the van's and the truck's near the same time. AAMOF, the warranty stuff is crammed in the ghetto fied garbage that is holding the battery in, but i think the 3 year warranty is expired

My mom said we will order battery tray, hanger, clamp, etc Monday and hopefully get it end of the week / beggining of next. I checked Autozone, and its like 30-40 bucks for a 63 amp, 40+ for 100 amp, which isn't bad, so ill check the alternator tomorrow after school and go from there.

*1972C10* · 10-04-2004, 08:51 PM

You might want to check on this alternator if your going to replace yours Not really any higher than the 63 amp these trucks use and its a direct swap 94 amp.

ALTERNATOR for a
1984 PONTIAC TRANS AM
Normal Stock
Special Order
Not Available

Item Part
No.
Warranty Core
Value Unit
Price Availability
Store Web
DURALAST
94 AMP DL7294 LLT $30.00 $64.99
PREMIUM QUALITY REMAN, SOME NEW COMPONENTS

VALUCRAFT
94 AMP 7294 1 YR $30.00 $54.99

http://www1.autozone.com/servlet/UiB...C%7EALTERNATOR

1986Silverado · 10-04-2004, 11:20 PM

My truck did the same thing and I ended up replacing the alternator and battery because the alt had fried the battery. It would charge fine, then I noticed at lights and stop signs the volt meter would drop to around 9 volts. I paid 49.99 at autozone for my 1year warranty 94 amp alternator. That was minus the core charge because I had it in my hands when I went in the door

cliffsta · 10-06-2004, 04:33 PM

OK i checked the alternator by first getting voltage from the battery with motor off (12 volts cause it had just been on a couple hours before, as it is so dead it probably wouldn't make any), then i started it up, and checked the volts on the battery again and it was up at 14.6 ish where it should be, so i have ruled the alternator out. Last night i ordered entire battery tray assembly and such, and some other goodies

Ill make a new thread about the other goodies tonight.

10-04-2004, 06:39 PM	#1
cliffsta Stepsides RULE Join Date: Jul 2004 Location: Pineville, LA Posts: 1,921	alternator questions OK, my batttery is toast, stick a fork in it. It barely makes 11 volts while driving. Idling at stoplights it falls down around 9 volts. How can i check my alternator to see if it is also going south? I know its getting heavy use because of the terminal battery that is running lights, radio, and windshield wipers. This leads to my next question. Shortly after starting it, there is this god awful ghostly sounding whail coming from the passenger side of the truck. And after i turn the truck off, there is a fast tick tick tick noise coming from the same area that slowly dies away. I honestly don't know exactly where the alternator is, but since the battery is on the right, im assuming the alternator is over there too. The belt worn maybe? Pully worn? Any ideas are welcome. Cliff __________________ 1981 Chevy C10 Custom Deluxe Stepside 350 V8, headers, side exhausts, 3-speed auto SOLD 1980 Chevy C10 Custum Deluxe Stepside 305 V8, Edelbrock Performer Intake, Edelbrock 1406 600CFM 4-barrel, TH350C. Bent rod. SOLD 1984 GMC Sierra Classic Longbed 6.2L Diesel SOLD 2009 Kawasaki KLX-250S too many mods for this signature 1999 Honda Accord EX 4-cylinder, 17" Motegi Wheels 215/45/17 Sumitomo tires, Tein S-Tech lowering springs, KYB GR2 shocks, Acura TL 20mm rear swaybar, debadged, blackhoused headlights, Short-Ram Intake Cardomain of the Accord

10-04-2004, 06:56 PM	#2
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	Sounds like your alternator is fried to me... Probally took your battery with it __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

10-04-2004, 06:59 PM	#3
hotrodhomi Registered User Join Date: Apr 2004 Location: Sacramento Posts: 3,737	take your volt meter and measure at the back of the alt. It should read 13.5 volts +/- Attached Images

10-04-2004, 07:10 PM	#4
cliffsta Stepsides RULE Join Date: Jul 2004 Location: Pineville, LA Posts: 1,921	thanks guys! I'll go check that after supper. if my alternator is bad, can i bring the core into Autozone or who ever and get a replacement for little? __________________ 1981 Chevy C10 Custom Deluxe Stepside 350 V8, headers, side exhausts, 3-speed auto SOLD 1980 Chevy C10 Custum Deluxe Stepside 305 V8, Edelbrock Performer Intake, Edelbrock 1406 600CFM 4-barrel, TH350C. Bent rod. SOLD 1984 GMC Sierra Classic Longbed 6.2L Diesel SOLD 2009 Kawasaki KLX-250S too many mods for this signature 1999 Honda Accord EX 4-cylinder, 17" Motegi Wheels 215/45/17 Sumitomo tires, Tein S-Tech lowering springs, KYB GR2 shocks, Acura TL 20mm rear swaybar, debadged, blackhoused headlights, Short-Ram Intake Cardomain of the Accord

10-04-2004, 08:21 PM	#6
cliffsta Stepsides RULE Join Date: Jul 2004 Location: Pineville, LA Posts: 1,921	nah i don't but the battery is my mom's van died a few months ago and we changed both the van's and the truck's near the same time. AAMOF, the warranty stuff is crammed in the ghetto fied garbage that is holding the battery in, but i think the 3 year warranty is expired My mom said we will order battery tray, hanger, clamp, etc Monday and hopefully get it end of the week / beggining of next. I checked Autozone, and its like 30-40 bucks for a 63 amp, 40+ for 100 amp, which isn't bad, so ill check the alternator tomorrow after school and go from there. __________________ 1981 Chevy C10 Custom Deluxe Stepside 350 V8, headers, side exhausts, 3-speed auto SOLD 1980 Chevy C10 Custum Deluxe Stepside 305 V8, Edelbrock Performer Intake, Edelbrock 1406 600CFM 4-barrel, TH350C. Bent rod. SOLD 1984 GMC Sierra Classic Longbed 6.2L Diesel SOLD 2009 Kawasaki KLX-250S too many mods for this signature 1999 Honda Accord EX 4-cylinder, 17" Motegi Wheels 215/45/17 Sumitomo tires, Tein S-Tech lowering springs, KYB GR2 shocks, Acura TL 20mm rear swaybar, debadged, blackhoused headlights, Short-Ram Intake Cardomain of the Accord

10-04-2004, 07:22 PM	#5
hotrodhomi Registered User Join Date: Apr 2004 Location: Sacramento Posts: 3,737	should be ~60 bucks... they can also check it for you. dont install your new alt with a dead battery.. you may get away with it, but you run the chance of burning the alt up. do you have a hydrometer to test the battery cells?

10-04-2004, 08:51 PM	#7
1972C10 Account Suspended Join Date: Dec 2003 Location: Texas Posts: 2,686	You might want to check on this alternator if your going to replace yours Not really any higher than the 63 amp these trucks use and its a direct swap 94 amp. ALTERNATOR for a 1984 PONTIAC TRANS AM Normal Stock Special Order Not Available Item Part No. Warranty Core Value Unit Price Availability Store Web DURALAST 94 AMP DL7294 LLT $30.00 $64.99 PREMIUM QUALITY REMAN, SOME NEW COMPONENTS VALUCRAFT 94 AMP 7294 1 YR $30.00 $54.99 http://www1.autozone.com/servlet/UiB...C%7EALTERNATOR

10-04-2004, 11:20 PM	#8
1986Silverado What I drive Join Date: Apr 2004 Location: Star, MS Posts: 418	My truck did the same thing and I ended up replacing the alternator and battery because the alt had fried the battery. It would charge fine, then I noticed at lights and stop signs the volt meter would drop to around 9 volts. I paid 49.99 at autozone for my 1year warranty 94 amp alternator. That was minus the core charge because I had it in my hands when I went in the door __________________ 1986 Chevy Crew Cab Dually(Choo-Choo Conversion) 2006 Chevy Equinox

10-06-2004, 04:33 PM	#9
cliffsta Stepsides RULE Join Date: Jul 2004 Location: Pineville, LA Posts: 1,921	OK i checked the alternator by first getting voltage from the battery with motor off (12 volts cause it had just been on a couple hours before, as it is so dead it probably wouldn't make any), then i started it up, and checked the volts on the battery again and it was up at 14.6 ish where it should be, so i have ruled the alternator out. Last night i ordered entire battery tray assembly and such, and some other goodies Ill make a new thread about the other goodies tonight. __________________ 1981 Chevy C10 Custom Deluxe Stepside 350 V8, headers, side exhausts, 3-speed auto SOLD 1980 Chevy C10 Custum Deluxe Stepside 305 V8, Edelbrock Performer Intake, Edelbrock 1406 600CFM 4-barrel, TH350C. Bent rod. SOLD 1984 GMC Sierra Classic Longbed 6.2L Diesel SOLD 2009 Kawasaki KLX-250S too many mods for this signature 1999 Honda Accord EX 4-cylinder, 17" Motegi Wheels 215/45/17 Sumitomo tires, Tein S-Tech lowering springs, KYB GR2 shocks, Acura TL 20mm rear swaybar, debadged, blackhoused headlights, Short-Ram Intake Cardomain of the Accord

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