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Ford 9N, 2N & 8N Discussion Forum
Show Parts for Model:

work light/headlight wiring on 8n

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bob pelton

07-16-2014 15:18:03
76.239.31.68



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I recently read a fella bought a 3 pole fused pull out switch to allow him to light headlights only, work light only or both head lights and work light on at the same time. I located the switch 6volt 3 position and fused but when I draw out the wiring it will backfeed and light all lights from the poles going only to work light and only head lights, do I need a couple I think you call them diodes that are like electrical check valves that allow power to s light but not backfeed to another pole? any one have a wiring diagram to do this. thanks in advance

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Plane Bart

07-17-2014 06:41:25
174.236.193.31



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 Re: work light/headlight wiring on 8n in reply to bob pelton, 07-16-2014 15:18:03  
You need to move the power supply ( incoming power from battery) to the common terminal this is the terminal that will have continuity too one or both of the switched terminals use a continuity tester to figure out which one it is Positive ground or negative ground power supply will not matter a switch only makes or breaks the circuit But you cannot put both together on a switch or you will have a dead short As far as tractor lights only having one wire the tractor chassis us your second conductor to complete the circuit

Bart Master Electrician

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Royse

07-16-2014 20:38:13
69.36.49.186



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 Re: work light/headlight wiring on 8n in reply to bob pelton, 07-16-2014 15:18:03  
"Switch doesn't care if it is 6 or 12 volt, positive or negative ground."

True statement.

If this was in response to my post, please re-read what I wrote.

My question was which side of the circuit was being switched.

Powered or grounded. Which might make a difference.



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rvirgil_KS

07-16-2014 21:43:53
50.93.233.149



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 Re: work light/headlight wiring on 8n in reply to Royse, 07-16-2014 20:38:13  
Just making the point that the switch normally connects the hot battery source (battery post) to the load (in this case lights). The switch is isolated from "ground" and does not care if it is operating in a positive or a negative ground system.

Confirms your point that ground polarity does not matter to the switch.

Also, as long as current limits are not exceeded it does not care whether if it is in a 6 or 12 volt circuit.

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Royse

07-16-2014 19:05:33
69.36.49.186



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 Re: work light/headlight wiring on 8n in reply to bob pelton, 07-16-2014 15:18:03  
As long as you are switching power side, that's all I wondered.

Is this the TSC switch that I posted about a while back?

If so I'd actually have to check where the exact terminals are,
but the "front" terminal is power in. IIRC, pulling it out one position

applies power to a single terminal (headlights), pulling out to the

second position applies power to that first terminal plus a second

one (work light) so both are on. The third position turns off the
first terminal but leaves the second one on (work light only).

Counting "Off", that's a four position switch. Not poles though.

Poles and positions (or throws) are two completely different things.

If that's what you have, I can get you a diagram of one of mine.
This post was edited by Royse at 19:08:12 07/16/14.

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bob pelton

07-16-2014 18:47:51
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 Re: work light/headlight wiring on 8n in reply to bob pelton, 07-16-2014 15:18:03  
I would be switching the power side or negative as batt. is pos. ground power comes off just below the resistor on left side of dash. above key. switch is off completely and then three settings as you pull out switch, so 4 pole?. here are my thoughts all in all off, first pull headlights, second pull all lights, 3rd pull only work light, this is how I would like it, work light on 8n has toggle but bulb is broke couldn't buy only bulb so bought whole light, not sure if I can switch bulbs old bulb has only one wire to it and is all glass don't see how this gets to ground to finish circuit. new light has no toggle

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Indiana Ken

07-17-2014 03:56:49
66.249.229.98



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 Re: work light/headlight wiring on 8n in reply to bob pelton, 07-16-2014 18:47:51  
Quoting Removed, click Modern View to see

It sounds like your switch should work as you describe. Perhaps your switch is faultly. Due to the number of output terminals (wire connections) on these switches there is very little space between them. You might examine the switch, I think you may find there is contact between two of the terminals creating the problem you describe.

The old work lamp should have two terminals on the glass bulb. One of the terminals is connected (inside) to the metal shell of the lamp. The circuit is completed (grounded) when the lamp is mounted to the tractor fender. At least that is how mine is constructed.

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rvirgil_KS

07-16-2014 18:16:03
50.93.233.149



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 Re: work light/headlight wiring on 8n in reply to bob pelton, 07-16-2014 15:18:03  
3 position switches I've seen are off - on 1 - on 2. It would have off - headlights or tail light on 1 -- both headlights and tail lights on 2

Diodes won't help, you need another position on the main switch or perhaps a second on/off switch to tail lights connected on position 1.

Switch doesn't care if it is 6 or 12 volt, positive or negative ground.



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Indiana Ken

07-16-2014 18:07:56
66.249.229.98



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 Re: work light/headlight wiring on 8n in reply to bob pelton, 07-16-2014 15:18:03  
Are you saying the switch is three position with one position being off? In that case I only see two choices and not three.

My work light has a toggle switch in the back of the shell. My pull switch selects head lights + work light or work light only. If I do not want to run the work light with the head lights I turn off the work light toggle switch. Normally I leave the work light toggle switch on so that, the light works with the pull switch.

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Royse

07-16-2014 17:17:20
69.36.49.186



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 Re: work light/headlight wiring on 8n in reply to bob pelton, 07-16-2014 15:18:03  
You don't need diodes in the lighting circuit.

Is your tractor 6V or 12V, positive or negative ground?

Not that the polarity of ground really matters other than
for ease of conversation. I am wondering if you are switching
the power side or the grounded side of the circuit.



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