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Tractor Talk Discussion Forum

Battery going dead

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K.B. in Pa.

08-15-2006 13:10:45




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Is there a way to test ans see if there is some thing draining a battery when the tractor is just sitting and not running? Thanks




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noncompos

08-15-2006 16:26:54




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 Re: Battery going dead in reply to K.B. in Pa., 08-15-2006 13:10:45  
A word of caution when swapping batteries or cables on anything computerised: avoid like the plague any sparking on posts and never let hot cable touch anything that grounds...the little chips and printed circuits can"t take the power surges like the old wired systems, and you can fry a couple hundred dollars with of pieces in an instant. My apoplogies if I"m belaboring the obvious.



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John T

08-15-2006 15:31:29




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 Re: Battery going dead in reply to K.B. in Pa., 08-15-2006 13:10:45  
KB, once you have done as posted below such as removing a battery cable to see if the discharge stops and/or using a test lamp as described etc., the way I locate a short once I know one is present is:

Remove the hot ungrounded battery cable,,,,, attach the alligator clamp lead end of a test lamp to the bare battery post, then probe n prod around with the sharp pointy end of the test lamp at wiring locations and terminals etc to see when the lamp glows CUZ THERES A CURRENT RETURN PATH TO GROUND (i.e. a short) if the lamp glows.

NOTE you gotta hunt n probe n prod on the BAT input side of switches such as lights or ignition cuz if you probe to the load side, the lamp should glow as it then has a returmn ground path. What youre looking for are places that lite the lamp that SHOULD NOT.

If you shut the tractor off and the ammeter swings to heavy discharge and the genny gets hot then the cutout relay inside the VR is likely sticking but thats a fast high current discharge as opposed to a slow trickle discharge that runs the battery down over a few hours or so.

Also, a bad battery can self discharge even without any short, you may wanna have a battery shop take a look at it. Insure theres electrolyte above all the plates and that no cells exhibit a gray or milky color indicative of a bad cell

John T

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Bus Driver

08-15-2006 13:39:05




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 Re: Battery going dead in reply to K.B. in Pa., 08-15-2006 13:10:45  
Remove the grounded battery cable. Then use a voltmeter between the now-empty battery terminal and the cable that was just removed. If it reads any voltage at all, something is draining the battery. Leave the voltnmeter in place while disconnecting various devices. When the faulty device is disconnected, the meter will drop to zero.



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TexMac

08-15-2006 13:34:26




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 Re: Battery going dead in reply to K.B. in Pa., 08-15-2006 13:10:45  
Disconnect a battery lead and connect small bulb of the correct voltage between the post and the battery cable you just disconnected. If the bulb lights, you"re drawing current somewhere. Smaller the bulb, the more sensitive the test. If it blows the bulb, you have a bad drain.



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Erran

08-15-2006 13:24:15




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 Re: Battery going dead in reply to K.B. in Pa., 08-15-2006 13:10:45  
Yes un hook the battery. When you unhook it if you get some sparks at the terminal you got something drawing. you can Also Leave it unhooked again until you need it and then hook it back up and see what you got.
Erran



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K.B. in Pa.

08-15-2006 13:18:19




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 Re: Battery going dead in reply to K.B. in Pa., 08-15-2006 13:10:45  
I forgot to say that the tractor is a posative ground. Thanks



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