Need to know if my Voltage regulator or alternator is bad - Ford Truck Enthusiasts Forums



1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck

Need to know if my Voltage regulator or alternator is bad

Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 04-27-2011, 05:35 PM
ODUFFY ODUFFY is offline
New User
Thread Starter
 
Join Date: Apr 2011
Posts: 1
ODUFFY is starting off with a positive reputation.
Need to know if my Voltage regulator or alternator is bad

This is what I have

77
F-250 Hiboy
390
NP205
Custom fuel tank in the bed

I installed a brand new painless wiriing harness last year, right after that I installed custom Speedhut Legacy gauges. Ever since I installed the wiring harness I haven't had a stable fuel gauge, my tach bounces a lot, and I think my oil and coolant gauges are a little high (oil's at about 90psi, and coolant's at about 230). BUT, my speedometer (which is electric) doesn't jump around and seems to be accurate. I've replaced the coil to see if that helps the tach but that wasn't helpful, except for having a new coil. lol.

So my question is this... would this all be cause by a bad alternator or Voltage regulator? And how do I test my Voltage Regulator? If I have to get a new alternator do I need one without a voltage regulator built in or does it not matter? I have a brand new Red top Optima battery too BTW.

Thanks in advance!
Duffy
Reply With Quote
  #2  
Old 04-27-2011, 07:39 PM
fmc400's Avatar
fmc400 fmc400 is offline
MSEE
 
Join Date: Apr 2004
Location: Austin, TX
Posts: 10,386
fmc400 has much to be proud offmc400 has much to be proud offmc400 has much to be proud offmc400 has much to be proud offmc400 has much to be proud offmc400 has much to be proud offmc400 has much to be proud offmc400 has much to be proud offmc400 has much to be proud offmc400 has much to be proud of
The voltage regulator, in theory, could cause erratic gauge readings. Do your headlights flicker? You could easily test this by connecting a multimeter (set to volts) across the battery terminals with the engine running, and making sure the reading doesn't move around significantly.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Good alternator, battery, volt. reg - what's wrong? Myfreeford Electrical Systems/Wiring 24 11-04-2016 07:50 PM
Voltage Regulaotr question.... kbautoserv Pre-Power Stroke Diesel (7.3L IDI & 6.9L) 4 11-01-2015 08:19 PM
voltage gauge problems 89danford 1987 - 1996 F150 & Larger F-Series Trucks 1 04-09-2015 01:04 PM
Electrical Help Needed Oregon Ron 1973 - 1979 F-100 & Larger F-Series Trucks 17 09-16-2013 02:31 PM
battery and oil warning lights wont come on mattthegreat 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks 10 05-31-2011 05:22 PM


Go Back   Ford Truck Enthusiasts Forums >

Tags
1980, 2006, 460, 75, 86, alternator, bad, built, escape, f100, ford, location, regulator, regulators, voltage

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 02:28 PM.