Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1987 - 1996 F150 & Larger F-Series Trucks
Sign in using an external account
Register Forgot Password?


1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks




 
Reply
 
LinkBack Thread Tools Search this Thread
  #1 (permalink)  
Old 10-11-2009, 03:06 PM
Roc879's Avatar
Roc879 Roc879 is offline
New User
Garage is empty, add now
 
Join Date: Mar 2009
Posts: 5
Roc879 is starting off with a positive reputation.
Voltage regulator, battery drain

1987 F250 Diesel, I have a battery drain. I disconnected negative terminal and used test light while pulling fuses one by one (doors closed no dome light), the light stayed on(bright). I unhooked the alternator and the light stayed on. I unhooked the voltage regulator and the light went off. Does anybody think I have found my problem or is there something else I should be doing?


Thanks
Reply With Quote
  #2 (permalink)  
Old 10-11-2009, 03:47 PM
Volvo92906's Avatar
Volvo92906 Volvo92906 is offline
Posting Guru
1988 Ford F-150
 
Join Date: Jul 2009
Location: Toledo, Ohio
Posts: 1,069
Volvo92906 is gaining momentum as a positive member of FTE.Volvo92906 is gaining momentum as a positive member of FTE.
If the light went off it sounds like a draw. Get a new or different one and test again.
__________________
en·gine noun -a machine for converting thermal energy into mechanical energy or power to produce force and motion.

mo·tor noun -a machine that converts electrical energy into mechanical energy, as an induction motor.
Reply With Quote
  #3 (permalink)  
Old 10-11-2009, 05:03 PM
jroehl jroehl is offline
Post Fiend
Garage is empty, add now
 
Join Date: Apr 2004
Location: Lafayette, IN
Posts: 6,300
jroehl has a spectacular reputation.jroehl has a spectacular reputation.jroehl has a spectacular reputation.jroehl has a spectacular reputation.jroehl has a spectacular reputation.jroehl has a spectacular reputation.jroehl has a spectacular reputation.jroehl has a spectacular reputation.jroehl has a spectacular reputation.jroehl has a spectacular reputation.jroehl has a spectacular reputation.
Did you have the test light between the negative battery terminal and the end of the negative cable?

Jason
__________________
-2003 E250 cargo 4.2L V6, 4sp electronic auto, 22 axle (work van)
-1993 F250 XLT xcab LB 351 2wd E4OD 4.10 open (parked, tranny issues)

Probably the greatest harm done by vast wealth is the harm that we of moderate means do ourselves when we let the vices of envy and hatred enter deep into our own natures.
Theodore Roosevelt
Reply With Quote
  #4 (permalink)  
Old 10-11-2009, 05:17 PM
Roc879's Avatar
Roc879 Roc879 is offline
New User
Garage is empty, add now
 
Join Date: Mar 2009
Posts: 5
Roc879 is starting off with a positive reputation.
Yes I had the test light between the neg. cable and terminal. But the light goes off if I disconnect the alternator or if I disconnect the regulator so I guess my question is "how do I know which is causing the drain?"
Reply With Quote
  #5 (permalink)  
Old 10-11-2009, 05:27 PM
Volvo92906's Avatar
Volvo92906 Volvo92906 is offline
Posting Guru
1988 Ford F-150
 
Join Date: Jul 2009
Location: Toledo, Ohio
Posts: 1,069
Volvo92906 is gaining momentum as a positive member of FTE.Volvo92906 is gaining momentum as a positive member of FTE.
If you disconnect either (alternator or regulator) it goes off? Maybe you have a draw at the wires from the starter relay (solenoid?) on the fender that goes to the alternator/regulator.
__________________
en·gine noun -a machine for converting thermal energy into mechanical energy or power to produce force and motion.

mo·tor noun -a machine that converts electrical energy into mechanical energy, as an induction motor.
Reply With Quote
  #6 (permalink)  
Old 10-11-2009, 07:05 PM
jroehl jroehl is offline
Post Fiend
Garage is empty, add now
 
Join Date: Apr 2004
Location: Lafayette, IN
Posts: 6,300
jroehl has a spectacular reputation.jroehl has a spectacular reputation.jroehl has a spectacular reputation.jroehl has a spectacular reputation.jroehl has a spectacular reputation.jroehl has a spectacular reputation.jroehl has a spectacular reputation.jroehl has a spectacular reputation.jroehl has a spectacular reputation.jroehl has a spectacular reputation.jroehl has a spectacular reputation.
Quote:
Originally Posted by Roc879 View Post
Yes I had the test light between the neg. cable and terminal. But the light goes off if I disconnect the alternator or if I disconnect the regulator so I guess my question is "how do I know which is causing the drain?"
There's your problem. You need to use an ammeter (not a voltmeter) in place of the test light. Then you would pull the fuses one by one, checking the ammeter each time. You should have no more than about 50-100 milliamps of draw with everything off, preferably closer to 50 mA or less. When you pull a fuse and get a significant drop in amperage draw, that circuit is your problem.

One other thing you should check is the voltage between each cell of your battery. Pop off the vent caps and stick the probes into the water of each adjacent pair of cells (i.e., 1-2, 2-3, 3-4, etc.). You should get a reading of about 2.1V between each pair. If you have a pair that reads 0, you have an internal short and the battery is bad.

Jason
__________________
-2003 E250 cargo 4.2L V6, 4sp electronic auto, 22 axle (work van)
-1993 F250 XLT xcab LB 351 2wd E4OD 4.10 open (parked, tranny issues)

Probably the greatest harm done by vast wealth is the harm that we of moderate means do ourselves when we let the vices of envy and hatred enter deep into our own natures.
Theodore Roosevelt
Reply With Quote
  #7 (permalink)  
Old 10-11-2009, 09:37 PM
95F350XL 95F350XL is offline
Posting Guru
Garage is empty, add now
 
Join Date: Aug 2007
Location: Belle Mead NJ
Posts: 2,021
95F350XL has a good reputation on FTE.95F350XL has a good reputation on FTE.95F350XL has a good reputation on FTE.
You can also use a test light, works the same was, when its dim the draw is low, when its bright the draw is high. Well on ur alt isnt the reg but into the alternator? Just get a new alt and plud it in, no need to swap it it. If ur light is still bright then there is another prob, is the light goes dim with the new alt plugged in then you know ur alt is messed up.
__________________
1991 F350 XLT Lariat 7.5L ZF 4x4 Headman Mids, True Dual 3" With Flowmaster Single Chamber, 16.5x10 AR Baja, 37x12.5 GY Wranger MT's
1999 F250SD 6.8L 4R100, Stainless Shortys, Stainless header back, Magnaflow Highflow cat, Magnaflow XL Muffler, 16.5x10 AR Baja, 37x12.5 GY MTR
88 Stang 347, 91 Grand Marquis, 03 Mazdaspeed Protege, 05 GSXR750
Reply With Quote
Old 10-11-2009, 09:37 PM
Reply

Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1987 - 1996 F150 & Larger F-Series Trucks

Tags
1988, 1996, 2000, 2002, battery, drain, draining, duty, f150, f250, ford, regulator, relay, starter, super, 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On
Forum Jump



All times are GMT -5. The time now is 10:28 AM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.5.2 ©2010, Crawlability, Inc.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company.



 
vbulletin Admin Backup