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Is there a way to check a light control?

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Mike CA

09-07-2007 23:43:58




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I want to take this light switch...

third party image



And put it in this ammeter box.

third party image

Is there any way I can check that switch first, to make sure it's good before I buy it from the junk yard?

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Mike CA

09-08-2007 09:49:40




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 Re: Is there a way to check a light control? in reply to Mike CA, 09-07-2007 23:43:58  

gene bender said: If you dont know how to operate one and you must not know how or you wouldnt be asking the questions...


Aviation Electronics Technician in the Navy. I've used them for years with avionics maintenance. I've just never messed with a 63 year old tractor before, so I don't know what transfers over. third party image

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gene bender

09-08-2007 09:40:06




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 Re: Is there a way to check a light control? in reply to Mike CA, 09-07-2007 23:43:58  
Dont pay too much as i have good ones with original I-H amp guage.



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Janicholson

09-08-2007 07:10:44




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 Re: Is there a way to check a light control? in reply to Mike CA, 09-07-2007 23:43:58  
Dear Mike,
Use the cover with the best finish. The one in the picture with the galvanized pip in front of it is better than the other metal, just switch the meters from on to the other.
There will be one wire coming from the amp meter and going to the fuse (on the switch), then to a switch terminal (may have no screw,just a tab of metal connecting the fuse) built in to the switch. It is power in. All other terminals with screws are output terminals.
Each should conduct (be connected) to the power in when the knob is turned from one position to the next. There should be a wire wound resistor on the back on the switch between two terminals. this is the light dimming resistor, and measures in the area of 1.5 to 2 ohms across it.
If you intend to put this back to correct police correct, and the generator is a three brush with cutout relay, then it needs a light switch that has 4 positions LHDB
Low charge, High charge, Dim lights and bright lights. This switch will have more terminals, and it will have two resistors, and some terminals will be ground terminals to the body of the switch! Good luck, JimN

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HENRY E NC

09-08-2007 06:49:09




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 Re: Is there a way to check a light control? in reply to Mike CA, 09-07-2007 23:43:58  
You can get meters anyplace. Dont buy a tiny one get one that is about 6X4 wnd dont buy a digital. The analog ones are easier to read and understand and dont take a college couse to understand. I have both and use the old one all the time. Should cost less than 30.00. Do you have a manual that describes the switch and the functions of the screws in back. If not I can email you one. Maybe someone else has a good schematic.

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Patrick Martin

09-08-2007 03:45:33




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 Re: Is there a way to check a light control? in reply to Mike CA, 09-07-2007 23:43:58  
Harbor freight.....$12 bucks.

Better to go with one from Radio Shack though.



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rumplestiltskin

09-10-2007 10:14:49




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 Re: Is there a way to check a light control? in reply to Patrick Martin, 09-08-2007 03:45:33  

My experience with Radio Shack is that they do not carry fuses for their own meters.

I let a friend use my Radio Shack meter. He brought it back with the fuse blown (probably tried to check voltage with the meter set to ohms). Guess what? No fuse at Radio Shack. I couldn't even order one!

I ordered a self-resetting current limiter from Digi-Key and soldered it in place of the fuse. It works great, but was an unnecessary hassle.

Now when I buy VOM's I make sure the fuses and batteries are reasonably common and available locally.

Mark W. in MI

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gene bender

09-08-2007 03:33:12




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 Re: Is there a way to check a light control? in reply to Mike CA, 09-07-2007 23:43:58  
If you dont have one yet you need to buy a meter so you can check for voltages and if the wires go where they are supposed to go. If you dont know how to operate one and you must not know how or you wouldnt be asking the questions get someone to show how a meter works and how to read one. You will find it valuable when restoring your tractor.



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Patrick Martin

09-08-2007 00:39:18




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 Re: Is there a way to check a light control? in reply to Mike CA, 09-07-2007 23:43:58  
Use an Ohm meter and check to see if the hot wire is being split correctly by the switch. There is one power in and I beleive three other terminals. One constant hot, one for the headlights, and one for head and tail light. Just check it with an Ohmmeter to see if it makes and breaks the circut.



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