New gauges, alternator charge wire lg/rd how to wire? - MustangForums.com



4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Reply
 
 
 
Thread Tools Search this Thread
Old 02-13-2012, 05:00 PM   #1
cisurfer
5th Gear Member
Thread Starter
 
Join Date: Aug 2006
Location: Central NJ
Posts: 2,158
Default New gauges, alternator charge wire lg/rd how to wire?

I'm building my own gauge cluster and removing the stock one. Going to use autometer gauges. I know coming off of the alternator is a lg/rd wire that turns on the voltage regulator and runs through the stock cluster. Im looking at the wiring diagram and it shows a 490 ohm resistor next to the bulb but I can't find a 490 ohm resistor anywhere. How can I wire this lg/rd exciter wire up to charge the alternator?
cisurfer is offline   Reply With Quote
Old 02-14-2012, 05:36 AM   #2
cliffyk
TECH SAVANT
 
cliffyk's Avatar
 
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,929
Default

You can use 390Ω and 100Ω resistors, both standard values, in series to create 490Ω resistance.


---/\/\/\390Ω/\/\/\---/\/\/\100Ω/\/\/\--- = 490Ω



This line is used to supply initial power to the field coils, then once the generator begins producing current it is self-exciting. At that point the regulator supplies near 1/2 the regulated output to the light green/red wire, which keeps the indicator lamp off.

If the generator output voltage falls below its proper value the voltage delivered to the lg/rd wire falls, turning the indicator on...
cliffyk is offline   Reply With Quote
Old 02-14-2012, 01:53 PM   #3
cisurfer
5th Gear Member
Thread Starter
 
Join Date: Aug 2006
Location: Central NJ
Posts: 2,158
Default

Awesome thanks cliff. Didn't think putting them inline would net the same result
cisurfer is offline   Reply With Quote
Old 02-14-2012, 01:58 PM   #4
cisurfer
5th Gear Member
Thread Starter
 
Join Date: Aug 2006
Location: Central NJ
Posts: 2,158
Default

And I would just connect it to a ign run wire? Do I need any type of diode to prevent back voltage? And would 1/2watt resistors work?
cisurfer is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Snow performance stage 2 MAF boos cooler install jwog666 Pipes, Boost & Juice 5 04-04-2016 04:23 PM
Bad cylinder? Dathan V6 (1994-2004) Mustangs 4 10-05-2015 05:52 AM
Slight surge at 1500ish rpm lmurf60 4.6L (1996-2004 Modular) Mustang 1 09-24-2015 10:07 PM
Diagnosing Fuel Pump & Pressure SteelerNation82 V6 (1994-2004) Mustangs 1 09-16-2015 07:11 AM
whats needed to swap a 4.6L into ratrod rksnow1 Motor Swap Section 0 09-14-2015 08:46 PM


Tags
04, alternator, charge, cj7, cylinder, diagram, diagrams, eliminate, exciter, gauge, mustanf, mustang, symptom, wire, wiring

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

Forum Jump


All times are GMT -5. The time now is 01:23 AM.