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Case Tractors Discussion Forum
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why would a 12v resistor start smoking?

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arod

05-20-2005 10:11:52




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What causes this and where to look for problems. System was fine until I wired up some lights, now when I pull out the stop/run switch, the resistor heats up and starts smoking.




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Walt Davies

05-23-2005 08:51:38




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 Re: why would a 12v resistor start smoking? in reply to arod, 05-20-2005 10:11:52  
If you have a magneto then you have no need for aballast resister they are only used to lower the voltage on an engine with a distributer. Look at the Amp meter one wire goes to the battery the other to the generator. Hook your light wire up to the side that goes to the gen. then to the light switch then to the light not in series if you have 12 volt lamps installed in series if they are the old 6 volt lamps not more than 2 in series.
John Salie who is on the forum has a real nice light switch with a built in fuse at a very good price. Well worth it to talk to him. Walt Davies

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Ed in Maine

05-21-2005 08:51:02




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 Re: why would a 12v resistor start smoking? in reply to arod, 05-20-2005 10:11:52  
rorange has it right. There is no need for a series resistor when hooking up lights unless you want to dim them by regulating the current through them. Current is the same for all loads in a series setup. Get rid of the resistor and replace it with an inline fuse. I=12V/R, where R is the resistance of the light bulbs measured in ohms with a meter. I would size the fuse 50% higher than the current you calculate.

Ed

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rgorange

05-20-2005 15:39:49




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 Re: why would a 12v resistor start smoking? in reply to arod, 05-20-2005 10:11:52  
Don"t think 6/12V has anything to do with it. Lights draw too much current to be connected via resistor. The wiring diagram for lights that I have (got off of this site a long time ago) shows the light switch (with inline fuse) connected to the generator side of the ammeter. Let me know if you want the diagram and I can email it to you. I don"t find it by searching this site. The only one I found now on this site is more of a parts list than a schematic.

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C. Amick

05-20-2005 11:42:45




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 Re: why would a 12v resistor start smoking? in reply to arod, 05-20-2005 10:11:52  
Sounds like your lights are pulling too much current. Are you using standard 12 V. tractor lights? Are you using one of those Chrysler type in-line resisters?



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arod

05-20-2005 12:03:40




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 Re: why would a 12v resistor start smoking? in reply to C. Amick, 05-20-2005 11:42:45  
ok... Hmmm. So I should NOT wire up to the junction block where the ignition comes together behind the switched side of the ign switch.

Three wires exist on that junction to be exact:
1) wire from the alternator that reads "TO BAT"
2) wire supplying current to the ign switch
3) wire to the positive battery cable for charging

This is NOT the place to grab a 'hot' for accesories then?

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C. Amick

05-20-2005 12:53:46




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 Re: why would a 12v resistor start smoking? in reply to arod, 05-20-2005 12:03:40  
If you are using 12 V. lights, I think the only thing you have to cut the power down on with the resister is the power wire going to the points?



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arod

05-20-2005 11:47:20




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 Re: why would a 12v resistor start smoking? in reply to C. Amick, 05-20-2005 11:42:45  
yes, using regular 12V bulbs from Napa. And a regular looking porcelein resistor.



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C. Amick

05-20-2005 12:24:30




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 Re: why would a 12v resistor start smoking? in reply to arod, 05-20-2005 11:47:20  
Check the Article Archives on this web site for help. I think there are some articles on 6 V. to 12 V. conversions.



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