PT Cruiser Forum  
Advertisements
       

Go Back   PT Cruiser Forum > General Forums > General PT Cruiser Discussions

PT Cruiser Forum

Advertisements
Alternator Output Volts

 
Like Tree2Likes

Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 17 Nov 2015, 03:41 pm
Regular Cruiser
 
Join Date: Oct 2006
Location: miami, florida, USA.
Posts: 125
Default Alternator Output Volts

2001 PT 102,000 miles.
Had a couple of hick ups upon start lately, like not enough power. My PT has always run perfectly as I have maintained very, very well.
Battery 12.0 volts engine off.
Alternator 13.0 volts at idle.

Could there be an issue here?
Reply With Quote
  #2 (permalink)  
Old 17 Nov 2015, 03:59 pm
LionPT's Avatar
Veteran Cruiser
 
Join Date: May 2014
Location: Central Florida
Posts: 4,231
Default Re: Alternator Output Volts

I'm not sure about the earlier models, but that seems a little low to me.
My 2006 is between 13.8-14.1 at idle...and usually around 12.6 off.
__________________

2006 Touring Edition in Cool Vanilla...aka/Ghost
Reply With Quote
  #3 (permalink)  
Old 17 Nov 2015, 04:18 pm
KA9VQF's Avatar
Cool Cruiser
 
Join Date: Jul 2014
Location: Savanna Illinois
Posts: 457
Default Re: Alternator Output Volts

Ideally you should see around 14.8 volts at the battery with the engine running.

If you have a VOM {Volt Ohm Meter} to check it with. A lot of folks have a voltage gauge in the dash of their cars. Some came as a stock component some have been added later.

I have one I can plug into the cigarette lighter of any car. All work pretty well but sometimes the stock dash mounted ones are a bit off.

How old is the battery in your car? Is it a maintenance free battery or can you pull the plugs on the top of the cells to check the electrolyte inside?

It may be you have a low cell more. If you can get the caps off you can test the liquid for its specific gravity with a cheap tester available at most auto parts stores, even Walmart has them for under $2.00.

If nothing else you can pull the battery and take it to an auto parts store and have it tested.
__________________
Don't put off until tomorrow what you might be able to put off indefinitely.

Ignorance can be cured with knowledge, but Stupid is forever.
Reply With Quote
  #4 (permalink)  
Old 17 Nov 2015, 05:24 pm
NitroPT's Avatar
Obsessed Cruiser
 
Join Date: Jun 2012
Location: USA kalyfornia
Posts: 15,027
Default Re: Alternator Output Volts

The first response is indicting a battery problem. Charge it and have it load tested.

The method of measuring the voltage must be more accurate then simple rounded to nearest whole number when testing. I recommended a digital volt/Ohm meter.

As for the battery voltage it is a little more complicated then simply measuring the voltage but on a PCM charging controlled PT Cruiser when the ASD relay is energized and no problem with the PCM or IPM then you should see between 13.50-14.25 volts @ 950 rpm idle speed. If any sensor fails the generator (alternator) will default to a 13.50 charge rate.
__________________

Dalai Lama
"Share you knowledge. It's the best way to achieve immortality."
ASE MASTER TECHNICIAN
Reply With Quote
  #5 (permalink)  
Old 17 Nov 2015, 05:30 pm
Veteran Cruiser
 
Join Date: Mar 2012
Location: darien il
Posts: 4,592
Default Re: Alternator Output Volts

i highly recommend you replace the batteries in the meter or verify its accuracy on another vehicle before proceeding. cheap insurance. bad numbers in will lead to bad advice.

-just a caution as batteries/alternators aren't cheap
Reply With Quote
  #6 (permalink)  
Old 17 Nov 2015, 09:58 pm
KA9VQF's Avatar
Cool Cruiser
 
Join Date: Jul 2014
Location: Savanna Illinois
Posts: 457
Default Re: Alternator Output Volts

Rob,
If he uses an analog VOM he really wouldn't need a battery in the meter at all. The voltage source will drive the meter just fine.

A digital meter would need a battery to run the LCD screen but that's all.
__________________
Don't put off until tomorrow what you might be able to put off indefinitely.

Ignorance can be cured with knowledge, but Stupid is forever.
Reply With Quote
  #7 (permalink)  
Old 17 Nov 2015, 10:58 pm
Veteran Cruiser
 
Join Date: Mar 2012
Location: darien il
Posts: 4,592
Default Re: Alternator Output Volts

No the digital one really do get screwy.

04 pt cruiser no crank no start
Reply With Quote
  #8 (permalink)  
Old 18 Nov 2015, 03:46 am
KA9VQF's Avatar
Cool Cruiser
 
Join Date: Jul 2014
Location: Savanna Illinois
Posts: 457
Default Re: Alternator Output Volts

I do own a few digital multimeters some came to me for free just for stopping in at a Harbor Freight store. My best one is a Fluke, it takes two AA batteries which have been in it since I got the thing used a little over 20 years ago.

It has never failed me so maybe I should pop it open and put a new pair of Duracell batteries in it.

Other than usually just liking analog VOM's better than digital ones because many times I can see the needle move perceptibly where a digital meter shows nothing at all is because you can use one to measure voltage either AC or DC with no battery in the thing at all.

My folks got me an RCA Senior Voltohmist VTVOM for my 6th birthday. I still have it and a small hoard of balance tubes for it. It has lived on many of my test benches throughout my life. I used to use it more when I was fixing various radios and building electronic things.

It is not really very handy for field use because you need to plug it in.
__________________
Don't put off until tomorrow what you might be able to put off indefinitely.

Ignorance can be cured with knowledge, but Stupid is forever.
Reply With Quote
  #9 (permalink)  
Old 18 Nov 2015, 10:18 am
Obsessed Cruiser
 
Join Date: Aug 2014
Location: Thousand Oaks, CA
Posts: 7,118
Default Re: Alternator Output Volts

If your voltmeter is working properly on the 2001 & 2002 PT Cruisers it has been known that there is a set of wires going from the crankshaft sensor to the PCM under the engine that is held up with a clip that holds it in place. This clip sometimes breaks off and the set of wires drop down rubbing on the half shaft or parts of the frame. Some members have lost all charging from the generator (alternator) with the alternator field wire shorting on the half shaft. You will need to jack up the PT Cruiser and make sure these wires are properly tied down. Also check the wires going to the generator and make sure the contacts are good as long as you are under the PT Cruiser. Make sure the generator belt is tight.
NitroPT likes this.
__________________
If at First You Don't Succeed - Try, Try Again

Last edited by ptcruisersteve; 18 Nov 2015 at 10:23 am.
Reply With Quote
  #10 (permalink)  
Old 18 Nov 2015, 05:28 pm
Regular Cruiser
 
Join Date: Oct 2006
Location: miami, florida, USA.
Posts: 125
Default Re: Alternator Output Volts

My battery is 19 months old/new.
Volt meter is digital and batteries are 3 months old.
I am going to check all the things mentioned by your generous comments and advise.
Reply With Quote
Reply


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

Posting Rules
You may not post new threads
You may not 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
alternator output voltage SilverCruiser Tech & Performance Forum 12 15 Jan 2017 07:47 pm
Alternator Output scatgo1 Tech & Performance Forum 2 16 Feb 2015 10:41 pm
Alternator output limit? dragracekid General PT Cruiser Discussions 5 22 Dec 2010 01:02 pm
Where to find a hi output alternator for a 2006 non-turbo?? Samson Tech & Performance Forum 0 27 Dec 2009 12:10 am
High Output Alternator yteka99 Tech & Performance Forum 2 03 Dec 2009 05:49 pm


All times are GMT -5. The time now is 06:51 pm.




Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.
vB.Sponsors