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Ronald Hribar

Electric clutch wiring

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Ok the cross of the T is constant positive with key on, ( Didn't check off). The pto switch completes the ground. ( Cub Cadet 2500 series) not sure if that will help but I hope it does. 

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Yea I was surprised myself I figured the switch was power supply and the clutch may be grounded to frame or thru the engine as well . I did use a meter though and there's no ground in the wiring unless you pull the switch out. Again that's on a Cub Cadet though. 

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It's pretty common practice these days for anything automotive in nature to have a wiring harness for almost everything (including grounds). My F350 wiring schematic shows an incredible number of ground wires run all over the place. We can thank computerized systems for that.

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You don't mention what tractor you're asking about, but with all Simplicity tractors that I've looked at wiring diagrams for, the switch supplies the +12v to the electric clutch.  Older tractors had the negative side of the clutch wired directly to ground or used the clutch case as ground (single lead coils).  The newer tractors had the negative side grounded through interlock switches or an interlock module. 

I'm not sure if the electric clutch coil cares which way the current  flows through the windings, but it's always better to wire it as the manufacturer prefers.

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Ronald Hribar

was originally a one wire system.

grounded thru case .

New clutch is two wire.

plus ground is diode  protected

So I ran power to clutch thru the top of T connector

and the ground thru the vertical part.

new switch disconnects both power and ground

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