Welcome to Club Hot Rod!  The premier site for everything to do with Hot Rod, Customs, Low Riders, Rat Rods, and more. 

  •  » Members from all over the US and the world!
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and hundreds of thousands of posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

 
Like Tree2Likes

Thread: Battery Draining
          
   
   

Reply To Thread
Page 2 of 4 FirstFirst 1 2 3 4 LastLast
Results 16 to 30 of 50
  1. #16
    pepi's Avatar
    pepi is offline CHR Member/Contributor Visit my Photo Gallery
    Join Date
    Dec 2006
    Location
    Woodstock
    Car Year, Make, Model: 34,stroker,32pu,2020 MustangGTpp2
    Posts
    1,109

    Here is a quick clip of how to test the charging system down and dirty straight forward.

    How to Test Alternator Voltage Output (AutoUpkeep.com) - YouTube

    But I thought your problem was battery drain, I am now lost. What are you trying to solve ?
    I have two brains, one is lost and the other is out looking for it

  2. #17
    Mudduck3's Avatar
    Mudduck3 is offline CHR Member Visit my Photo Gallery
    Join Date
    Nov 2011
    Location
    Long Beach
    Car Year, Make, Model: 65 Mustang
    Posts
    98

    Trying to find the source of the drain. When I do that same voltage test it drops when running. I've taken the alternator down and had it tested. They said it was good. I'm just going to put a new one on.

  3. #18
    pepi's Avatar
    pepi is offline CHR Member/Contributor Visit my Photo Gallery
    Join Date
    Dec 2006
    Location
    Woodstock
    Car Year, Make, Model: 34,stroker,32pu,2020 MustangGTpp2
    Posts
    1,109

    Is the alternator a one wire or three wire install ? I ask this because a one wire needs higher RPMs to start charging. If it tested good and it is a one wire alternator the voltage drop is cause by the fact that the car is running off the battery voltage.

    Now the drain:

    Using your meter, remove the + battery cable. Select the amp setting on the meter. Hook the black lead of the meter too the + battery post. Then the red meter lead too the + car cable. You are now ready to check for the source of the drain.

    At this point you should see some sort of amp reading, the reason will be the circuit is active and draining the battery. Just what you thought and are looking for. Now how do we find that source?

    Let’s say your fuse box has 6 fuses. Divide the fuse panel in half, top too bottom or left too right. Remove 3 fuses, check the meter, if it reads 0 then you now know one of those 3 circuits with the fuses removed has a fault. Install 2 fuses, is the meter still reading 0, bingo that last fuse still removed is in the circuit that is not playing nice.

    If you find that when the first 3 fuses were remove, let’s say from the bottom half. Checking the meter you see it is showing a drain. Simply replace those three and start from the top half.

    The worst-case scenario is all fuses remove and the meter is still showing a drain. This would suggest that the drain is from the fuse panel back to the firewall plug. Separate that plug, if the drain is still there then the source in under the hood.

    Hope the how to is understandable and will help you troubleshoot this.
    Make sure you close the doors to kill the dome light, ignition switch off pull the key out.
    Last edited by pepi; 06-07-2012 at 09:26 PM.
    I have two brains, one is lost and the other is out looking for it

  4. #19
    Mudduck3's Avatar
    Mudduck3 is offline CHR Member Visit my Photo Gallery
    Join Date
    Nov 2011
    Location
    Long Beach
    Car Year, Make, Model: 65 Mustang
    Posts
    98

    It's a three wire.

    Thanks for all the help and suggs.
    Last edited by Mudduck3; 06-08-2012 at 03:08 PM.

  5. #20
    firebird77clone's Avatar
    firebird77clone is offline CHR Member Visit my Photo Gallery
    Join Date
    Sep 2005
    Location
    Hamilton
    Car Year, Make, Model: 69 nomad, 73 charger, 74 vega
    Posts
    3,878

    I recently had an alternator short to ground, it blew the fusible link.

    It is equally possible for an alternator to 'leak' to ground.
    .
    Education is expensive. Keep that in mind, and you'll never be terribly upset when a project goes awry.
    EG

  6. #21
    pepi's Avatar
    pepi is offline CHR Member/Contributor Visit my Photo Gallery
    Join Date
    Dec 2006
    Location
    Woodstock
    Car Year, Make, Model: 34,stroker,32pu,2020 MustangGTpp2
    Posts
    1,109

    "It's a three wire" ...ok Mudduck3

    Still playing with this....

    I found this digram and it shows an external regulator, if the regulator is not working then that could explain the voltage drop at start up. Meaning the regulator is not changing state and you are running off the battery.


    http://averagejoerestoration.com/res...rams/1965c.jpg

    Something else to notice, there are TWO main disconnects, firewall plugs.

    Let's start simple ..........Could this be what is happening to you ?

    You charge the battery and take a drive, let's say the battery is not charging, but will power the car long enough for your drive. The next day it is low because the battery is not charging, not draining over night, not charging while driving.

    You had the alt checked, it came up good the next item to suspect would be the regulator. Two suggestions, get a regulator 20 bucks or so.

    2. Set the multi meter on OHMS and take a reading from pin # 2 from the bottom, reference the diagram to the case or ground, same / same electrically.

    It should read some OHMs if it reads nothing or open that is indicating that the coil for the relay is open and failed. Even if the reading comes up right, there is still another problem that could be going on with the regulator and that is old age. The relay contacts themselves may be burnt & pitted enough as to not allow an electrical connection when closed. Hence not allowing the battery to charge.

    Good luck keep in touch....
    Last edited by pepi; 06-09-2012 at 08:16 AM.
    I have two brains, one is lost and the other is out looking for it

  7. #22
    HarryH's Avatar
    HarryH is offline CHR Member Visit my Photo Gallery
    Join Date
    Dec 2011
    Location
    Tomball
    Car Year, Make, Model: 32 Ford Coupe
    Posts
    11

    Disconnect negative lead on battery and then hook up a small 12 volt light bulb between negative battery cable and negative battery post (use aligator clips). With car off, the light bulb should be out but your's is probably lit. Start pulling fuses, one at a time, until light goes out. When light goes out, you have found the circuit that is draining your battery. Look at everything on that circuit for the unintentional ground or short.

  8. #23
    Mudduck3's Avatar
    Mudduck3 is offline CHR Member Visit my Photo Gallery
    Join Date
    Nov 2011
    Location
    Long Beach
    Car Year, Make, Model: 65 Mustang
    Posts
    98

    I replaced the alternator this weekend. The voltage, while running, returned to normal 13.8v. When I get home today I'll check where it's at. Fingers crossed.

  9. #24
    Mudduck3's Avatar
    Mudduck3 is offline CHR Member Visit my Photo Gallery
    Join Date
    Nov 2011
    Location
    Long Beach
    Car Year, Make, Model: 65 Mustang
    Posts
    98

    New alt. . . still dropped. Changed the regulator . . . still dropped. I think I'm gunna take her out on the back forty and "put 'er down"!! Ha ha!! When I changed out the regulator the contacts look good, but when I looked at the plug contacts they looked kind of old. I'm guessing it's the original harness, where all components are new from rebuild.

  10. #25
    pepi's Avatar
    pepi is offline CHR Member/Contributor Visit my Photo Gallery
    Join Date
    Dec 2006
    Location
    Woodstock
    Car Year, Make, Model: 34,stroker,32pu,2020 MustangGTpp2
    Posts
    1,109

    I assume by drop you mean after start up ? To help you, please clarify what the problem is. Not charging or draining with the ignition off.

    " When I changed out the regulator the contacts look good, but when I looked at the plug contacts they looked kind of old"

    Contacts looked good, like not opening and closing, no markings?

    On the schematic wire # 35 should have 12 vdc after start up. That will energize that regulator. Disconnect the plug, start the car meter that wire # 35 see what you got.

    Or pop the cover and watch the regulator contacts notice if they change state after start up. The regulator is no more then a relay.

    You have a generator dash light what is that doing?
    This was a working system right, after rebuild?
    I have two brains, one is lost and the other is out looking for it

  11. #26
    Mudduck3's Avatar
    Mudduck3 is offline CHR Member Visit my Photo Gallery
    Join Date
    Nov 2011
    Location
    Long Beach
    Car Year, Make, Model: 65 Mustang
    Posts
    98

    Sry, by dropping I mean after sitting all night it drops from 12.7 down to 12.15. It still starts up and charges, about 13.8 while running. The contacts on the reg. looked like new, no markings. The reg. is sealed so I can't get the visual but I will do the #35 wire check. I don't know what you mean by generator dash light. It has oil and alt. light but that's it. They both light up nice and bright. Yes, the system worked fine for 4 years. Pop didn't drive it much and it sat for awhile. I ended up switching out the carb due to the Holley gettin gunked up from varnish in the tank. Then a day soon after, the bat. was dead and the saga began. Now I'm lucky enough to have the opportunity to get advice from you guys.

  12. #27
    pepi's Avatar
    pepi is offline CHR Member/Contributor Visit my Photo Gallery
    Join Date
    Dec 2006
    Location
    Woodstock
    Car Year, Make, Model: 34,stroker,32pu,2020 MustangGTpp2
    Posts
    1,109

    Draining, good now we are talking apples and apples, It sounds like the car is charging, forget the regulator test.



    Remember how to hook the meter up to read the battery drain using the AMP scale? The meter needs to be in series with the battery to read AMPs. Someone suggested using a light bulb instead of a meter, that could work, but a meter will tell you how much the drain is in AMPs.

    Referring to this digram: http://averagejoerestoration.com/res...rams/1965c.jpg

    See the starter relay, look at the post that has the battery wired to it.

    Remove the small wires from the started relay. Now attach each wire one at a time and notice what wire causes the meter to give a reading. Tell me how many small wires are there.

    There are two # 37 ( BLK- YELL) wires, one from the alternator and the other to the fuse box. The one to the fuse box also feeds the light switch and the ignition. Tell me what you find out and we can pick this back up.

    This will tell you where the problem may be, engine compartment or interior, fuse or accessory related. I found a picture of a 65 mustang fuse box and it looks like it only has 5 fuses,. Is that what yours looks like?

    Please tell me some more about what is there electrically. glove box cigarette lighter, AC that type of information.
    I have two brains, one is lost and the other is out looking for it

  13. #28
    NTFDAY's Avatar
    NTFDAY is offline CHR Member Visit my Photo Gallery
    Join Date
    Aug 2003
    Location
    Springfield
    Car Year, Make, Model: '66 Mustang, 76 Corvette
    Posts
    5,208

    One thing I would surely check is the dimmer switch as it's location can lead to rust and it shorting out.
    Ken Thomas
    NoT FaDe AwaY and the music didn't die
    The simplest road is usually the last one sought
    Wild Willie & AA/FA's The greatest show in drag racing

  14. #29
    rspears's Avatar
    rspears is offline CHR Member/Contributor Visit my Photo Gallery
    Join Date
    Sep 2007
    Location
    Gardner, KS
    Car Year, Make, Model: '33 HiBoy Coupe, '32 HiBoy Roadster
    Posts
    10,684

    Quote Originally Posted by NTFDAY View Post
    One thing I would surely check is the dimmer switch as it's location can lead to rust and it shorting out.
    Ken, another long shot is a cigarette lighter. Had one years back that was stuck "in" part way, creating a bad path direct to ground. Chased that one for a few hours, and could not believe that a $2 lighter element "fixed" my problem!
    Roger
    Enjoy the little things in life, and you may look back one day and realize that they were really the BIG things.

  15. #30
    NTFDAY's Avatar
    NTFDAY is offline CHR Member Visit my Photo Gallery
    Join Date
    Aug 2003
    Location
    Springfield
    Car Year, Make, Model: '66 Mustang, 76 Corvette
    Posts
    5,208

    Quote Originally Posted by rspears View Post
    Ken, another long shot is a cigarette lighter. Had one years back that was stuck "in" part way, creating a bad path direct to ground. Chased that one for a few hours, and could not believe that a $2 lighter element "fixed" my problem!
    Agree, Roger. In 62 I bought a 40 2dr standard sedan that was draining the battery. I spent the better part of 4 weekends trying to find the culprit. My dad had a Ford mechanic friend come over and the problem was the ignition switch It was worn out and shorting across the terminals. Once replaced, problem solved. I was stationed in San Diego at the time and bus fare to Long Beach, where the car was, was eating me alive.
    Ken Thomas
    NoT FaDe AwaY and the music didn't die
    The simplest road is usually the last one sought
    Wild Willie & AA/FA's The greatest show in drag racing

Reply To Thread
Page 2 of 4 FirstFirst 1 2 3 4 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Links monetized by VigLink