This will take you to the main site where there is history, technical information and other information on these cars.
This takes you back to the main page of the forums.
This is the control panel to change your password, information and preferences on this message board.
Click here if your lost your password or need to register on this message board. You must be a registered user to post. Registration is free.
Search this board for information you need.
Click here to buy cool Squarebirds mechandise.
Click here to support For $20 annually receive 20mBytes webspace, a Squarebirds e-mail address and member's icon on the message board.
Old 07-27-2013, 02:16 PM
T-Bird Lover's Avatar
T-Bird Lover T-Bird Lover is offline
Join Date: Jun 17 2013
Posts: 44
T-Bird Lover is on a distinguished road
Default Battery Drain


I have a 56 T-Bird that is draining batteries in less than 15 minutes. After two new batteries drained, I took car to generator shop who said generator was fine. Then the starter went out so we thought that was pulling the charge.
Well, new starter and a carburator rebuild (as it started leaking) I just went through another battery.
Someone said possibly voltage regulator could be bad.
Anyone have any clues?
Reply With Quote
Old 07-27-2013, 03:05 PM
simplyconnected's Avatar
simplyconnected simplyconnected is offline
Slow Typist
Join Date: May 26 2009
Posts: 7,558
simplyconnected is on a distinguished road

Originally Posted by T-Bird Lover View Post
...Someone said...
There's a lot of wrong info freely given all over the net. I would use sound troubleshooting techniques and let the tool tell me where the problem is. Draining a 50 amp/hr battery in fifteen minutes usually makes wires hot.

'56 was the first year Thunderbirds used 12 volts. Have you got a 12 volt test light? If not, buy a cheap one or make it yourself from a dash light bulb and a lamp holder. DO NOT use an LED.

Simply pull one of your battery cables off and connect the test light between the battery cable (you just took off) and the battery post it came from. If the light shines you have a drain. If it doesn't shine, your battery may have an internal short.

To troubleshoot the drain, disconnect the B wire from your voltage regulator. If the light goes off, put the B wire back on and lift the other two (generator) wires off your voltage regulator. If it still stays on, your regulator is shorted to ground. Open it and inspect the relays the normally open contact on the far RH side may be stuck together, a coil may be shorted or the resistors may be bad.

If your light stays on when pulling the B wire off your regulator, put it back on and go to the starter solenoid. Disconnect the battery wires from that post. All the wires to your dash, windows, seats and headlights start here. If the light goes off when you pull the wires off the starter solenoid, follow the yellow wire. Make sure it isn't frayed and arcing anywhere. This wire has no fuse.

Do that and get back with us. - Dave
My latest project:
CLICK HERE to see my custom hydraulic roller 390 FE build.

"We've got to pause and ask ourselves: How much clean air do we need?"
--Lee Iacocca
Reply With Quote

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

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 09:29 AM.

Driving, racing or working on cars can be hazardous. The procedures and advice on this website including the message board are opinion only. and its webmasters and contributors do not guarantee the correctness of the advice and procedures. The and its webmasters assume no liability for any damage, fines, punishment, injury or death resulting from following these procedures or advice. If you do not have the skills or tools to repair your car, please consult a professional. By using this site you agree to hold harmless the, its authors and its webmasters from any resulting claim and costs that may occur from using the information found on this site.

Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Any submissions to this site and any post on this site becomes property of . The webmasters reserve the right to edit and modify any submissions to this site. All material on this is site is copyrighted by the Reproduction by any means other than for personal use is strictly prohibited. Permission to use material on this site can be obtained by contacting the webmasters. Copyright 2002-2016 by