Squarebirds, Rocketbirds, and Fifties/Sixties Ford Discussion Forum

Squarebirds, Rocketbirds, and Fifties/Sixties Ford Discussion Forum (http://squarebirds.org/vbulletin/index.php)
-   1955 To 1957 Little Birds - General Technical Discussion (http://squarebirds.org/vbulletin/forumdisplay.php?f=61)
-   -   Battery Drain (http://squarebirds.org/vbulletin/showthread.php?t=15496)

T-Bird Lover 07-27-2013 02:16 PM

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?

simplyconnected 07-27-2013 03:05 PM


Originally Posted by T-Bird Lover (Post 77504)
...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

All times are GMT -4. The time now is 11:31 PM.

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 Squarebirds.org . The webmasters reserve the right to edit and modify any submissions to this site. All material on this is site is copyrighted by the Squarebirds.org. 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 Squarebirds.org.