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Old 09-17-2003, 04:32 PM
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Battery Drain

Hi Everyone,

Can someone shed some light on this problem for me?

Ya see, I have a 89 Bronco2 that has been sitting for about a year while I did some restoration to the body. Now that I am almost ready for the road, I have gone through 2 batteries. What happens is, after I shut the engine off, there is still a major drain on the battery. I can watch my Voltmeter count the volts down like crazy and in about 25 mins, there is not enough juice in the battery left to start the truck. If I unplug the Alternator, the drain stops. I have 2 plugs on my alternator (1 to a voltage regulator I think) I am only a novice with electrical stuff, and I have read some other posts here that told me how to check for the drain. Now I think I found it I wonder how to fix it other than a new alternator.

Can anyone give me some advice?

Thanks a bunch

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Old 09-17-2003, 06:23 PM
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I would unplug all the accesories wired to the alt except the main batt wire.If the drain is still there,replace the alternator.If the drain is gone,look at the accesories.Someone correct me if this sounds wrong.
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Old 09-17-2003, 09:06 PM
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if the draw goes away when you unplug the alt, it is probably shorted internally, and will need replaced. be sure to replace the wiring and plug ends. these usually come with the new unit. if not replaced they can and will catch fire. good luck !
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Old 09-18-2003, 12:53 AM
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If you unplug the alt, and the draw goes away, you got a bad alt. (diodes) change the alt. and regulator
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Old 09-18-2003, 04:14 PM
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make sure on the connection TO the alternator that you have a fiber washer under the terminal so you do NOT have metal to metal contact with the frame of the alternator, only with the screw there-on. if you have a washer (non-metal, obviously) then with it hooked up, disconnect one fuse at a time, or the wires going to the fuses and look for a little spark when you make or brake contact. if it sparks anywhere other than the circuit that works the dome light (because you have the door open) you will find where the short is, i hope

if no sparks, then your short does not pass thru the fuse box and you have to search elsewhere
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Old 09-18-2003, 08:35 PM
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HEY IAM: If you pull the alternator off most auto electric service shops will test it for free. Around here Auto Zone, Advance Auto Parts and others will check it in the car for free....DAVE
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Old 09-18-2003, 09:39 PM
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Arrow

Not to question your work, but when I have a problem appear after I worked on a vehicle that wasn't there before, I ALWAYS recheck my work first, and I've been doing it since the mid sixties. If you disconnected any wiring that would be the first place to start checking. A diode could have gone bad in the alternator, but it is highly unlikely that it did while it was setting disconnected.
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Old 09-18-2003, 10:51 PM
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Pull all the fuses out and go accross the contacts with a test light if the light lights up fully you have a direct short to ground.It may light slightly as your testing in series,relacing the fuse with the test light.
More than likly its prolly the altenator,I've had that same problem and it was the altenator.Like said above allot of parts stors will spin it for free and tell ya if its good or not.
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