Ford Ranger Forum - Forums for Ford Ranger enthusiasts!

Go Back   Ford Ranger Forum - Forums for Ford Ranger enthusiasts! > Ford Ranger Technical > Electrical Tech
Forgot Password? Join Us!


Reply
 
LinkBack Thread Tools Search this Thread

  #1  
Old 07-15-2012, 09:31 PM
Learning to use the forums
 
Join Date: Jul 2012
Posts: 3
Default voltage and Electrical Problems

I have a 2002 ford ranger 4.0 4x4 ext cab auto with 195xxx miles
Ok this is whatís happening:
The truck voltage keeps dropping. I put a volt meter on it and it reads 12.00V at the lowest with all the accessories running, but it doesnít stall. The battery and the alternator are good.
I started pulling fuses with the voltmeter on it and I didnít see any improvements in the voltage
The first sign of trouble was a 75A fusible link that blew out the one the lets the alt. charge the battery.
This is what stopped working:
1. Cruise control only works when it feels like it.
2. Now I put the truck in 4wd high or low and it stays in 2wd and the relay by the passenger door just clicks on and off and just keeps cycling on and off till I put it back in 2wd.
I hope someone can help me I canít afford to take it to the shop. Thanks
__________________
2002 ranger 4x4 4.0
1963 galaxie 500
1959 f-100
Reply With Quote
  #2  
Old 07-16-2012, 07:40 PM
Ford Tough
 
Join Date: May 2009
Posts: 464
Default Re: voltage and Electrical Problems

I see 3 separate issues.

First pull the alt and have it bench tested, sounds like the regulator or brushes are weak.
__________________
99 x-cab 4x4 4.0l auto
mods, cranked t-bars, silencer delete, k&n drop in, Trans Go stage 3 shift kit,3200stall Fuddle Racing Torque Converter,
VANIR 63mm TB, Roush split rear exit exhuast, E-Fan, JBA headers
Auto up/down both windows, OHC, EATC

03 Crown Victoria Police Interceptor
Reply With Quote
  #3  
Old 07-16-2012, 10:24 PM
If it works,don't fix it!
 
Join Date: Dec 2011
Posts: 966
Default Re: voltage and Electrical Problems

Quote:
Originally Posted by ranger134x4 View Post
I have a 2002 ford ranger 4.0 4x4 ext cab auto with 195xxx miles
Ok this is whatís happening:
The truck voltage keeps dropping. I put a volt meter on it and it reads 12.00V at the lowest with all the accessories running, but it doesnít stall. The battery and the alternator are good.
I started pulling fuses with the voltmeter on it and I didnít see any improvements in the voltage
The first sign of trouble was a 75A fusible link that blew out the one the lets the alt. charge the battery.
This is what stopped working:
1. Cruise control only works when it feels like it.
2. Now I put the truck in 4wd high or low and it stays in 2wd and the relay by the passenger door just clicks on and off and just keeps cycling on and off till I put it back in 2wd.
I hope someone can help me I canít afford to take it to the shop. Thanks

With everything turned on your truck you should not see voltage less than 12.9 vdc and between 13 - 14.5 vdc in normal use depending on the batteries state of charge.
Now that said, I would remove the alternator and battery and have them bench tested. The Alternator uses the battery as a reference voltage so if the battery is borderline it will make the alternator
look bad when it isn't!!! The battery should be fully charged before it's load tested..
__________________
2011 Ranger XLT 2x4,4.0 SOHC, 5 Speed Auto, 3.55 Rear. Oxford White.

Simplicity is the ultimate sophistication.

Torque it down till it breaks off, then back it off 1/4 turn.
Reply With Quote
  #4  
Old 07-17-2012, 02:55 AM
Blinded by the light
 
Join Date: Sep 2009
Posts: 7,674
Send a message via AIM to FireRanger
Default Re: voltage and Electrical Problems

You just said your fusible link blew. Of course you have low voltage. The alternator is not doing anything with that blown doofus. Nothing is going to work properly with low voltage. You need to replace that fusible link before you waste your time on anything else.

There is also a fuse in the panel under the hood for the alternator. And the third fuse related to the alternator is the air bag light / battery light fuse in the cab.
__________________
(Formerly)
FireRanger
2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide
Reply With Quote
  #5  
Old 07-17-2012, 06:56 AM
If it works,don't fix it!
 
Join Date: Dec 2011
Posts: 966
Default Re: voltage and Electrical Problems

Quote:
Originally Posted by FireRanger View Post
You just said your fusible link blew. Of course you have low voltage. The alternator is not doing anything with that blown doofus. Nothing is going to work properly with low voltage. You need to replace that fusible link before you waste your time on anything else.

There is also a fuse in the panel under the hood for the alternator. And the third fuse related to the alternator is the air bag light / battery light fuse in the cab.
I assumed he was smart enough to have repaired the fuseable link since he already found it!!???
__________________
2011 Ranger XLT 2x4,4.0 SOHC, 5 Speed Auto, 3.55 Rear. Oxford White.

Simplicity is the ultimate sophistication.

Torque it down till it breaks off, then back it off 1/4 turn.
Reply With Quote
  #6  
Old 07-17-2012, 07:31 AM
Blinded by the light
 
Join Date: Sep 2009
Posts: 7,674
Send a message via AIM to FireRanger
Default Re: voltage and Electrical Problems

I think you're giving him too much credit. He's saying his battery and alternator are, and at the same time reporting 12.0 volts with the engine running. One does not support the other.

If he did replace the fusible link already, then one of those other two fuses could be be blown. If so, the alternator will not have field current to begin generating power.
__________________
(Formerly)
FireRanger
2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide
Reply With Quote
  #7  
Old 07-18-2012, 08:20 AM
Learning to use the forums
 
Join Date: Jul 2012
Posts: 3
Default Re: voltage and Electrical Problems

Yes I replaced the fusible link. The voltage I got was at the battery terminals not the alt. Now I had the alternator rebuilt I know itís good, the battery I had tested advanced auto parts they said it was fine. maybe advanced is wrong, to me everything points to the battery, but when I walk in and have them test it, and they say its good, well that just stumped me. I will buy a new one when I get the money. Now I havenít found the reason the fusible link went in the first place, and why now the 4wd wonít engage maybe its two different problems. Any ideas where I should start.
__________________
2002 ranger 4x4 4.0
1963 galaxie 500
1959 f-100
Reply With Quote
  #8  
Old 07-18-2012, 10:34 AM
Blinded by the light
 
Join Date: Sep 2009
Posts: 7,674
Send a message via AIM to FireRanger
Default Re: voltage and Electrical Problems

The battery is fine. There is nothing you've said indicating otherwise. Please check the rest of what I suggested before randomly throwing parts at it and wasting time/money.

Quote:
Originally Posted by FireRanger View Post
There is also a fuse in the panel under the hood for the alternator. And the third fuse related to the alternator is the air bag light / battery light fuse in the cab.
When you turn the key to ON (not start), does the battery and air bag light come on? if no, the fuse in the cab is popped. If yes, the fuse is fine; when you start the engine, does the battery light stay on or go off?
__________________
(Formerly)
FireRanger
2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide
Reply With Quote
  #9  
Old 07-18-2012, 02:52 PM
Ford Tough
 
Join Date: May 2009
Posts: 464
Default Re: voltage and Electrical Problems

Just because the alt was rebuilt doesn't mean they tested it or did it right. Pull it.

With the truck running and not going over 12v you have a charging problem. Soon its not going to start and your battery will need a some juice.
__________________
99 x-cab 4x4 4.0l auto
mods, cranked t-bars, silencer delete, k&n drop in, Trans Go stage 3 shift kit,3200stall Fuddle Racing Torque Converter,
VANIR 63mm TB, Roush split rear exit exhuast, E-Fan, JBA headers
Auto up/down both windows, OHC, EATC

03 Crown Victoria Police Interceptor
Reply With Quote
  #10  
Old 07-18-2012, 03:07 PM
Blinded by the light
 
Join Date: Sep 2009
Posts: 7,674
Send a message via AIM to FireRanger
Default Re: voltage and Electrical Problems

Quote:
Originally Posted by blhde View Post
Just because the alt was rebuilt doesn't mean they tested it or did it right. Pull it.

With the truck running and not going over 12v you have a charging problem. Soon its not going to start and your battery will need a some juice.
That is exactly the "blind throwing of parts" I'm saying needs to be avoided. You troubleshoot before you start pulling parts and replacing them.
__________________
(Formerly)
FireRanger
2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide
Reply With Quote
  #11  
Old 07-18-2012, 07:50 PM
Ford Tough
 
Join Date: May 2009
Posts: 464
Default Re: voltage and Electrical Problems

Quote:
Originally Posted by FireRanger View Post
That is exactly the "blind throwing of parts" I'm saying needs to be avoided. You troubleshoot before you start pulling parts and replacing them.
I cant figure out if your in favor of testing the alt or not.


The 4wd issue is likely a fuse or the shift motor needing to be cleaned. Work on the big red flag of not charging first before you worry about the extra stuff the truck does.
__________________
99 x-cab 4x4 4.0l auto
mods, cranked t-bars, silencer delete, k&n drop in, Trans Go stage 3 shift kit,3200stall Fuddle Racing Torque Converter,
VANIR 63mm TB, Roush split rear exit exhuast, E-Fan, JBA headers
Auto up/down both windows, OHC, EATC

03 Crown Victoria Police Interceptor
Reply With Quote
  #12  
Old 07-18-2012, 08:00 PM
Blinded by the light
 
Join Date: Sep 2009
Posts: 7,674
Send a message via AIM to FireRanger
Default Re: voltage and Electrical Problems

I'm in favor of following the proper troubleshooting instructions I posted earlier. This is what you do before removing / replacing parts.
__________________
(Formerly)
FireRanger
2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide
Reply With Quote
  #13  
Old 07-19-2012, 05:47 AM
Learning to use the forums
 
Join Date: Jul 2012
Posts: 3
Default Re: voltage and Electrical Problems

Ok thanks for the info. Iíll stop being lazy, and test and troubleshoot. And Iíll test the alt. when I get a chance to.
__________________
2002 ranger 4x4 4.0
1963 galaxie 500
1959 f-100
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
electrical problems mile high 2.3 4-Cylinder Tech 1 06-27-2012 06:32 PM
2001 Ford Ranger voltage problems roofgoof23 Electrical Tech 6 09-23-2011 04:55 AM
Electrical problems bigSEAN General Ford Ranger Discussion 4 07-09-2011 06:03 PM
electrical problems hess1222 Electrical Tech 16 06-14-2010 08:11 AM
Electrical Problems sgampp01 Electrical Tech 1 03-30-2010 01:10 PM



Search Engine Friendly URLs by vBSEO 3.6.0 ©2011, Crawlability, Inc.