How Do You Test Your Alternators Output? - Car Audio Classifieds!
Car Audio Classifieds!  

Go Back   Car Audio Classifieds! > Car Audio Help & Discussion > General Car Audio Discussion & Questions

General Car Audio Discussion & Questions All general car audio discussion goes here. Need help installing speakers, headunits, amps or electrical? Having problems with equipment? Have questions about a product, post here.


Notices

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 05-20-2018, 05:34 PM
only126db's Avatar
The One U Love 2 Hate
 
Activity Longevity
0/20 20/20
Today Posts
0/11 sssss2943
Location: Houghton Lake MI
Thanks: 7
Thanked 105 Times in 87 Posts
iTrader: (8)
Feedback Score: 8 reviews
Default How Do You Test Your Alternators Output?

I bought a Hi Output Alternator (supposedly) and dont have a load tester so what I did was hook my clamp meter on Alternator main cable, put my DMM on Battery terminals and with all my accessories on (heater, brights, fog lights) I watched the amperage and voltage at idle, it was very unimpressive, rather sickening actually. Then at 2100-2200 rpm I did the same but with my system running a 40hz tone at full tilt.... I know this wouldnt give me total capability of the alternator but I believe it clued me into this alt being a total fake.

Tell me if I am wrong....with an alt capable of 150 @ idle and 300 @ 1200 rpm I shouldnt have had a whole lot of voltage drop @ 2200rpm drawing 190 amps correct....
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 05-22-2018, 10:56 AM
New CACO Member
 
Activity Longevity
0/20 4/20
Today Posts
0/11 sssssss19
Location: Florida
Thanks: 1
Thanked 1 Time in 1 Post
iTrader: (0)
Feedback Score: 0 reviews
Default

Are you getting voltage drop from draw or is your voltage without draw low to start with?

If your voltage is low when starting the car and no load from the amps then it could be your voltage regulator.

I know I was unimpressed with my mechman 240 because the voltage regulator on my car kept it the same as the stock alt. About 13.9 when I start the car. Drops to about 13.5 after it heats up over an hour. Drops by about 0.5 volts when hitting the solid notes at full volume. Its just the voltage regulator in my case. Steve meade even did a video on how he had to get a voltage booster to go between the cars voltage regulator and the alternator to get 14.4 out of a mechman.
Reply With Quote Quick reply to this message
  #3  
Old 05-22-2018, 11:39 AM
only126db's Avatar
The One U Love 2 Hate
 
Activity Longevity
0/20 20/20
Today Posts
0/11 sssss2943
Location: Houghton Lake MI
Thanks: 7
Thanked 105 Times in 87 Posts
iTrader: (8)
Feedback Score: 8 reviews
Default

Quote:
Originally Posted by OpenGL View Post
Are you getting voltage drop from draw or is your voltage without draw low to start with?

If your voltage is low when starting the car and no load from the amps then it could be your voltage regulator.

I know I was unimpressed with my mechman 240 because the voltage regulator on my car kept it the same as the stock alt. About 13.9 when I start the car. Drops to about 13.5 after it heats up over an hour. Drops by about 0.5 volts when hitting the solid notes at full volume. Its just the voltage regulator in my case. Steve meade even did a video on how he had to get a voltage booster to go between the cars voltage regulator and the alternator to get 14.4 out of a mechman.
Voltage fluctuated way more than I liked, I only have a main 150A fuse, alt was supposedly rated @ 300A @ 1200rpm, I pulled a peak of 190, average around 160's but voltage dropped down to just over 12V before I shut down my test. My test was a 40hz tone playing through my system which was only one 1600rms @12.5v class D amp. If I drove my truck @ 3000rpm cruizing down the hwy no system or accessories on voltage being monitored through my OBDII port my voltage bounced from 12.5-15V.....I am sending alt back today....

When I put old alt back on, voltage was much steadier and more predictable, increase volume, voltage goes down, lower volume, voltage goes up....etc Problam is, alt is weak and only pushing 115A
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message
 
  #4  
Old 05-23-2018, 01:44 PM
Azalin_00's Avatar
Baller on a Budget
 
Activity Longevity
0/20 16/20
Today Posts
0/11 ssssss255
Location: Houston, TX
Age: 33
Thanks: 36
Thanked 22 Times in 16 Posts
iTrader: (3)
Feedback Score: 3 reviews
Default

I’m having the same problem with my 320a hairpin. Voltage spikes, voltage drops, and on only saz 1500. Lights and dash dim before I reach full tilt and unsteady voltage worries me. I got the alt new and installed it with a brand new agm as well, but still doesn’t seem to be able to push the 1500.
__________________
2014 F-150 Supercrew (Daily driver) Stock

1997 Chevy Tahoe (Parked) (2) 24" SHDs and all the fixings coming soon!
Reply With Quote Quick reply to this message
  #5  
Old 05-23-2018, 03:00 PM
Elite Member
 
Activity Longevity
0/20 15/20
Today Posts
0/11 ssssss543
Location: ma
Thanks: 12
Thanked 51 Times in 49 Posts
iTrader: (2)
Feedback Score: 2 reviews
Default

Sounds like belt slip common on ho alts if running a smaller than stock pulley. Might need a better wrap or tighter belt. A smaller belt is easier than adding an extra pulley to add contact area but sometimes you will need to increase contact area.
Reply With Quote Quick reply to this message
  #6  
Old 05-24-2018, 09:39 AM
only126db's Avatar
The One U Love 2 Hate
 
Activity Longevity
0/20 20/20
Today Posts
0/11 sssss2943
Location: Houghton Lake MI
Thanks: 7
Thanked 105 Times in 87 Posts
iTrader: (8)
Feedback Score: 8 reviews
Default

Quote:
Originally Posted by dbjunior View Post
Sounds like belt slip common on ho alts if running a smaller than stock pulley. Might need a better wrap or tighter belt. A smaller belt is easier than adding an extra pulley to add contact area but sometimes you will need to increase contact area.
I wish it were belt slip, not though.... When I told seller the issues they didnt even try to have me troubleshoot it, they just said send it back.
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Car Audio Classifieds! forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Location
Where you live
Level of Car Audio Knowledge
What's your level of car audio?

Log-in



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Js Alternators Bench Test 275amp 6phase hairpin (284amps) JsUltimateSounds Testing & Scientific Data Discussion 1 06-06-2015 02:20 PM
High Output Alternators califaplayer707 General Car Audio Discussion & Questions 21 07-02-2013 01:48 PM
Overstock Sale! GM high output alternators! MECHMAN General Car Audio Discussion & Questions 39 01-13-2012 08:35 AM
WTB 2 hi output gm alternators loud avalanche Wanting to Buy (WTB) 17 11-14-2010 02:51 PM

» Amps
A/d/s/
Advent
Alphasonik
Alpine
American Bass
ARC Audio
Atomic
Audio Art
Audio Gods
Audiobahn
Audiocontrol
Audiopipe
Audison
Aura
Autotek
Avionixx
Bazooka
Beyma
Blaupunkt
Boss
Boston Acoustics
Bravox
Cadence
Cascade (CAE)
CDT Audio
Cerwin Vega
Clarion
Clif Designs
Concept
Coustic
Critical Mass
Crossfire
Crunch
DB Drive
DC Audio
DC Power
DEI
Denon
Diabolo
Diamond
Digital Designs
Directed
DLS
Dual
DYnamat
Dynaudio
Earthquake
Eclipse
Elemental Designs
ESX
Eton
Farenheit
Fi Car Audio
Fix My Speaker
Focal
Fusion
Genesis
Ground Zero
Hafler
Helix
Hertz
Hifonics
Hushmat
Image Dynamics
Infinity
Interfire
JBL
Jensen
JL Audio
JVC
Kenwood
Kicker
Knu Konceptz
Kole Audio
Kove Audio
Lanzar
Lightning Audio
Linear Power
MA Audio
Magnat
Marantz
Massive Audio
MB Quart
McIntosh
Memphis
Metra
MMATS
Mobile Authority
Morel
MTX
Nakamichi
Niche Audio
O2 Audio
Ohio Generator
Optima
Orion
Oxygen Audio
OZ Audio
PG Audio
Phase Linear
Phoenix Gold
Pioneer
Polk
Power Acoustik
Powerbass
Powermaster
Precision Power
Profile
Pyle
Pyramid
RadioShack
Rainbow
Rampage
RE AUdio
Rockford Fosgate
Scanspeak
Scosche
Seas
Sony
soundstream
Sparkomatic
SPL Dynamics
Stinger
Sundown Audio
Swiss Audio
Targa
TC Sounds
TREO Engineering
TRU
Tsunami
Ultimate
US Acoustics
US Amps
Velodyne
Vifa
Viper
Visonik
Xtant
Zapco
Zed Audio
Powered by vBadvanced CMPS v3.2.3
Links
Amp Guts
amplifier, amp guts, ampguts, car audio classifieds, speakers and subs for sale with listings of 12 volt sound systems. Security systems for sale for aftermarket car audio equipment with amplifier and amps for sale
Car Audio Forum
car audio forum, moble audio, car stereo, wholesale car audio, 12 volt, with, amplifier, amp, subwoofer, sound quality, buy car audio, and sell automotive stereo systems for cars
Car Audio Sound Quality Forum
Sound QUality science based car audio forum, amplifier, subs and speaker design, fabrication help, sound systems forum, aftermarket car audio website for sound quality.
Car Stereo Forum
DIYMA car audio stereo forum for 12 volt car audio subwoofer and amplifier systems that have sound quality with wholesale car audio products.


All times are GMT -5. The time now is 02:06 AM.


Powered by vBulletin
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.6.0
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.