Posted by FORD 1710 on April 01, 2011 at 16:44:06 from (172.129.109.195):
In Reply to: TRACTOR FIRES posted by Detmurds on March 31, 2011 at 15:44:38:
<< Last summer I was tracking down a bad short on another tractor when I found I could get 6-10 volts between the negative terminal and the tractor frame with the positive cable taken off the battery! Even between negative and the plastic battery case! >>
If you are using a digital meter it will measure very low currents and therefor show voltage where you wouldn't expect. This is why using a digital meter to diagnose wiring problems can lead to false a diagnosis. A test light with a incandescent bulb is best to use.
<< When I listened close the battery was clicking and ticking up a storm. I'll tell you that battery was out in the open on the gravel driveway in a big hurry! Batteries scare me because of stuff like that! >>
If the battery was just being charged ( or is overcharged ) that is hydrogen gas bubbling to the surface.
Batteries can explode on their own, but that is pretty rare ( 2 in the 30 years I've been in / close to the automotive industry ). When they do go boom, there isn't a fire just lots of acid.
Wiring rubbing through is the most likely cause of a fire. Proper routing / inspection is vital as is having a fusible link on the main power feed leading from the battery to the main tractor wiring. Having push to reset type breakers on small circuits is helpful as well.
12 or 24V isn't a issue for fire as there will be enough watts to generate heat. However at higher voltages there is a chance of throwing a spark ( or ball of hot copper ) and starting a fire.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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