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Ignition Switch Question...

T

Tom Bowman

Member
Ferguson TO-20, converted to 12 volt.

It has a Cole-Hersee brand ignition switch with 5 terminals, marked as follows: "BAT", "IGN", "ACC" "ST" and "GRD". (I can't find a model number on the switch. I checked the Cole Hersee website, but I can't find a switch that looks like it.)

It seems to have three positions: off, on, and start. (Start springs back to on.) I start the tractor by turning the switch to "on", and using the gearshift start switch.

A wire hooked to "IGN" runs to the coil. Wire hooked to "BAT" runs to the terminal on the starter switch that the positive battery cable is also hooked to. Wire runs from "ACC" to the alternator. "ST" and "GRD" don't have anything hooked to them.

I'm installing headlights - where do I connect them?

Also, from what I've read on the board, it doesn't sound like this is the correct type ignition switch - should I change it?

Thanks for your help. I know nothing about automotive/tractor wiring.
 
With that type ignition switch you'll need a separate headlight switch.

You can connect it either to the Bat terminal of the ignition switch if you want lights any time, or connect it to the Acc terminal of the ignition switch if you want the lights to only come on when the ignition switch is on.

The remaining terminals on the ignition switch will not be used.

There is a handy headlight switch that has a fuse built onto the back, good idea to protect your wiring harness.

Be careful what you buy, the cheapest switches from the auto supply aren't designed for the exposure of dust and water that a tractor endures. Buy either a real tractor switch or a marine duty that's sealed from water exposure. There is an ignition switch that has a headlight position if you'd rather go that route. On this site it is " Starter Switch Part Number 180681M93" It would eliminate the need for a separate headlight switch.
 
Thanks, Steve - that's exactly what I needed to know.

I already have a fused "tractor-type" headlight switch - I just wasn't sure if I also needed a different kind of ignition switch.
 
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