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Discussion Forum

Light switch replacement?

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08-26-2002 15:13:56

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My AC 100SP combine has a three position pull switch that operates the headlights. It seems like part way out has the lights on and all the way out the charging rate goes way up. There is a fuse on one side of the switch and a reostat on the other side of it. It doesn't seem to work now. What can I get to replace this switch? Is there a switch like this on AC tractors? What model?

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08-26-2002 16:39:09

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 Re: Light switch replacement? in reply to peabody, 08-26-2002 15:13:56  
I agree with STEVE NJ. it sounds like the B-C-WD switch. You have a resistor on the side that is connected to the "F" terminal on the generator and the other side is grounded (on resistor). Normal operation is that the "F" terminal goes thru some resistance and you only get 3 amp charge. When the lgiht switch is pulled out the bypasses the resistor and shorts the "F" to ground and you get 10 amp charge. Kind of like 1/2 of a voltage regulator on a newer unit. You can ground the "F" terminal and go to full charge if you just run a few hours a week. If you run everyday, i would get it repaired so you dont overcharge the battery. Other wires on the switch just run the lights as you said.

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Steve in N.J.

08-26-2002 16:21:47

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 Re: Light switch replacement? in reply to peabody, 08-26-2002 15:13:56  
I'm not familiar with the headlight switch in a combine, but I've been repairing and restoring the headlight/charging switch which is in the early model B,C,WD, etc. tractors for Allis folks which sounds very similar to what you're talking about. (It wouldn't surprise me if it was the same switch.)If you can't find a switch, I may be able to repair/restore it for you. Drop me a line if you strike out with finding a switch. I'm sure someone here on the board is probably familiar with that particular switch if it's not the same as the tractors use... Steve B.

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Greg Ballantyne

08-26-2002 18:42:37

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 Re: Re: Light switch replacement? in reply to Steve in N.J., 08-26-2002 16:21:47  
Steve, maybe you know what may have happened to my switch/charging system. I have a 49 B, and one day I had to get a new battery for it. The battery was slightly taller that the battery box needed, and I noticed some sparks in the box where the switch is when I operated the switch. Then one day as I started the tractor, got on it and moved the gas some I noticed that there was a small fire on the top of the battery box, and heavy sparking in the switchbox. This is when I discovered that the new battery was too tall, sometimes the neg. terminal was grounding to the box. Unfortunately, the switch and the amp guage on the box no longer appear to work properly (or at all, so far as I can tell), but since I need to replace the moving parts in my starter & I start with the crank, and I took the lights off, I haven't been too concerned. The charging system is eating up batteries some, the last one lasted only one year or less, and I might want to put lights on it & fix the starter, but I know I'll have to fix the switch, guage, and charging first. Any ideas where to start?

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Steve in N.J.

08-26-2002 20:15:48

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 Re: Re: Re: Light switch replacement? in reply to Greg Ballantyne, 08-26-2002 18:42:37  
Sounds like you dead shorted the hot battery terminal to the battery box. In turn, it back fed the charging/headlight switch, blew the fuse there, and moved on to shish-ka-bob the ammeter. Wow, you probably have the start of a new recipe' there! Have you ever heard of a "Tuna melt"? Well, sounds like you have an "Allis Melt"! Just kidding, but I would think since things are quite "cooked" in the ammeter box, it's probably "full fielding" the generator, and the generator is givin' the battery all she got and greatly overcharging the battery to where it's sulfating the battery. Hence, the new battery each year. Not good on the generator either. Does the generator get super hot while the machine is running? If it is, I would bet a pay check (and that's not much)that's what's happening there. I think you need to take some time there and see what you'll need to renew the electrical system. Could I interest you in a wiring harness for starters? ............Steve B.

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