How-to: Alternator voltage test. - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Forum Ford Forum

» Auto Insurance
» Featured Product
ยป Wheel & Tire Center

Go Back   Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Do it Yourself - How-To > .
Register Home Forum Active Topics Photo Gallery Auto Loans Insurance Garage Mark Forums Read Auto Escrow is the premier Ford Forum on the internet. Registered Users do not see the above ads.
LinkBack Thread Tools Display Modes
Old 02-26-2012, 16:48   #1 (permalink)
Registered User
tbird100636's Avatar
Join Date: Jan 2005
Location: Massachusetts
Age: 33
Posts: 1,830
Read How-to: Alternator voltage test.

Reply to: 2001 Mustang Alternator Issues...

You need to check the wiring. Start simply. When it doesn't charge next time wiggle or move the 3 way connector and its wiring. If it starts charging intermittently as you do this, there is an issue with the connector terminals being spread open, or the wires be partially broken right near the connector or where the wires enter the connector. new connector from Ford is the fix.

If wiggling doesn't change anything get a voltmeter. With the negative lead clipped to the negative terminal, disconnect the three way connector and probe the terminal of the Yellow/White wire with the positive lead. There should be battery voltage here at all times. Next, probe the terminal of the Light Green/Red wire. There should be battery voltage or close to it. Probe the heavy battery lead (Black/Orange) at the alternator. Should be battery voltage. Last test is voltage drop from positive cable clamp to the heavy battery lead on the alternator. Clip the positive lead of the meter to the positive cable clamp. probe the heavy lead on the alternator with the negative test lead. There should be 0.5V or less. This should be a start for you, diagram is below.

Master ASE Certified L1 Chrysler Technician- still a Ford fan at heart.
1964 Thunderbird Hardtop- Chantily Beige- 390 FE 4V V8-Uncle's Car
1966 Thunderbird Convertible- Red- 390 FE 4V V8- Uncle's other car- waiting for paint and body work!!!
tbird100636 is offline   Reply With Quote
Sponsored Links

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Do it Yourself - How-To > .

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

Powered by vBadvanced CMPS v3.2.2

All times are GMT -7. The time now is 09:59.

Powered by vBulletin® Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.