Electrical problem/question... HELP! Bob, anybody! - Ranger-Forums - The Ultimate Ford Ranger Resource


General Technical & Electrical General technical and electrical discussion for the Ford Ranger that does not fit in any other sub-forum.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 09-25-2005
rngprerunner's Avatar
Member
Thread Starter
 
Join Date: Jun 2004
Location: Long Beach CA
Posts: 3,453
Electrical problem/question... HELP! Bob, anybody!

Now that I'v got your attention...

I have a problem with my carging system I believe. Any time a small load it put on the batery gauge drops quite a bit. For example, if my AC is on high (blower on high) the batery level gauge drops down to almost the quarter line... I have an idea but any thoughts? Thanks!
Reply With Quote
  #2  
Old 09-25-2005
Member
 
Join Date: May 2004
Location: Fuquay Varina, NC
Posts: 3,048
take it to autozone and have it tested, they can do a load test on it as well. if youve never changed the alternator before on a 99 i wouldnt be suprised if it needed to be changed out.
Reply With Quote
  #3  
Old 09-25-2005
V8 Level II's Avatar
RF Veteran
iTrader: (4)
 
Join Date: Nov 2004
Location: Michigan
Posts: 7,834
First, check the battery cable connections - all of them (4?), hot and ground at both ends.

Regulator or the alternator itself? Battery could be no longer taking a charge?

IMO, you need to have it checked locally on a charging system load tester. I think some battery places will do a free charging system check in the hopes of getting you in the door and selling you something.
Reply With Quote
  #4  
Old 09-25-2005
rngprerunner's Avatar
Member
Thread Starter
 
Join Date: Jun 2004
Location: Long Beach CA
Posts: 3,453
I just checked the batery cabels yesterday, they are good.

Battery is a 1year old Optima Red.. sure hope its fine.

Alternator is a rebuilt god knows what that is three years old now and taken on a lot of water over the years... guess this is what I'm leaning towrd... lol..
Reply With Quote
  #5  
Old 09-25-2005
FireRanger's Avatar  
Join Date: May 2004
Location: CT
Posts: 0
Yea, it's probably toast. Most reputable autparts stores can load test the alternator for you.
Reply With Quote
  #6  
Old 09-25-2005
graniteguy's Avatar
Member
iTrader: (3)
 
Join Date: Jul 2005
Location: Texas
Posts: 3,221
Put a voltmeter on the battery while the truck is off. Do it again with the motor started. If the voltage is higher while the engine is running, then your alternator is probably fine.
Reply With Quote
  #7  
Old 09-25-2005
Member
 
Join Date: May 2004
Location: Fuquay Varina, NC
Posts: 3,048
that test will only show if an alternator is bad, its not a load test like most auto places can do. just ride your lazy *** to autozone
Reply With Quote
  #8  
Old 09-25-2005
rngprerunner's Avatar
Member
Thread Starter
 
Join Date: Jun 2004
Location: Long Beach CA
Posts: 3,453
All the autozone's around here you have to take the alternator in to them... they dont come out and do it on the truck. I'll make a couple calls tomorrow...

How would I get my hands on of them nifty 130amp stock alternators the Tremors have?
Reply With Quote
  #9  
Old 09-25-2005
graniteguy's Avatar
Member
iTrader: (3)
 
Join Date: Jul 2005
Location: Texas
Posts: 3,221
Quote:
Originally Posted by SoundPer4mance
that test will only show if an alternator is bad,
Isn't that the point? To each his own, but putting a couple of prongs on the battery is better than removing the alternator, standing in line at auto zone, etc etc.
Reply With Quote
  #10  
Old 09-25-2005
rngprerunner's Avatar
Member
Thread Starter
 
Join Date: Jun 2004
Location: Long Beach CA
Posts: 3,453
Quote:
Originally Posted by graniteguy
Isn't that the point? To each his own, but putting a couple of prongs on the battery is better than removing the alternator, standing in line at auto zone, etc etc.
I dont have a problem with no load.. thats the point Bob is making.. I'm going to try it though, it should be putting out ~14volts with no load, then I'll turn on the AC and see what it does, if it drops back to 11-12 volts it will at least give an indication.. so your both on track..
Reply With Quote
  #11  
Old 09-25-2005
rngprerunner's Avatar
Member
Thread Starter
 
Join Date: Jun 2004
Location: Long Beach CA
Posts: 3,453
Ok so you know how when you try to get your truck to have its problem so you can diagnose it it never does it? Well you guessed it. It has done this for the last week every day, but now it wouldnt do it in the driveway... lol..

So.. how do I get a tremor alt.? lol..
Reply With Quote
  #12  
Old 09-25-2005
n3elz's Avatar
RF Veteran
 
Join Date: Jun 2004
Location: Kennett Square, PA
Posts: 10,620
Quote:
Originally Posted by graniteguy
Put a voltmeter on the battery while the truck is off. Do it again with the motor started. If the voltage is higher while the engine is running, then your alternator is probably fine.
Good idea but a little more to it than that.

1. Battery alone, no load should be about 12.6 or above. If it's sat awhile, maybe 12.4 or so.

2. Alternator should raise the voltage to AT LEAST 13.8 volts with the motor running, no load. Loaded voltage should not drop below 12.8 volts or you stop charging the battery and start draining it. Really, with a loaded voltage that low, you'd be in the situation of balance -- really neither charging nor draining and that alone is a bad sign. Anything less than about 13.2 volts and the battery isn't charging much if at all.

3. Maximum voltage from the alternator shouldn't be much more than 14.2 to 14.5 volts -- more than that for any length of time fries a battery by overcharging.

Optima's are great batteries but they have a VERY high failure rate, FYI.
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Fog Light Problem: Bob 0RangerEdge2 General Technical & Electrical 3 12-13-2007 10:29 AM
Question for Bob, John, or anybody, about the tone ring in the rear axle... rngprerunner Drivetrain Tech 13 04-23-2007 12:35 PM
Electrical problems.. Help Bob! r0ng5 General Technical & Electrical 6 02-05-2007 10:35 AM
Anybody heard from Bob Jusnes? TORQUERULES 4.0L OHV & SOHC V6 Tech 10 01-22-2007 04:03 PM
2003 Taurus - Heating/Cooling Fan Question - Need help quick - Bob? mental ambiguity General Technical & Electrical 11 07-05-2006 09:32 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are Off
Refbacks are Off



All times are GMT -6. The time now is 06:04 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.