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Massey Harris & Massey Ferguson Tractors Discussion Forum
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Ignition switch wiring

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Bill Darte

10-29-2005 06:18:31




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My MF135 Perkins Gas has an ignition switch with 4 terminals....
BAT, IGN, ACC around the edge of the switch and a fourth (unmarked) from an extended terminal in the center of the switch.

Big Dean's pictures show 3 unlabeled terminals running to volt.reg and coil, another to neutral safety, and another to Ammeter.

I assume the IGN goes to neutral safety.... what about the other two....since BOTH wires eventually go to starter where the battery connects (by diagram), do they both come off the BAT terminal? Or does one come off ACC or the center terminal on my switch?

Where to running lights come off?
Where does the dash guages power come off?

Help would be appreciated as my tractors wiring was almost nonexistant when I got it. I've got her all fixed up and putting it back together now, but don't want to burn things up by miswiring...

Thanks for any help!

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Alberta Mike

10-29-2005 19:07:50




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 Re: Ignition switch wiring in reply to Bill Darte, 10-29-2005 06:18:31  
Could you email me at the following address?

mike46@icrossroads.com

I have a friend who has just rebuilt his MF 135 gas and he has what he thinks is a problem. You might see my post down below here asking for Big Dean. My friend would like an opinion from someone with a MF 135 gas (152 cubic inch engine). Thanks .... MIKE



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John T

10-29-2005 06:41:01




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 Re: Ignition switch wiring in reply to Bill Darte, 10-29-2005 06:18:31  
Bill I have absolutely no wiring diagram of your tractor nor of that particular switch, so can only say from experience how similar type switches work in similar applications THEREFORE if someone with a real diagram or experience in that tractor says different BELIEVE THEM OVER ME.

GENERIC START/IGNITION SWITCH WIRING

BAT is the hot input voltage terminal (power for the switch) which often derives its voltage from the load (NOT to battery/starter) side of an ammeter. That same electrical equivalent point could be the BAT terminal on a Voltage Regulator or the hot unswitched (where big battery cable is) side of a starter solenoid or switch

IGN is what feeds the coil when switch is in the ON and Start (spring) positions

ACC is used to feed lights or other accessories even when the ignition is NOT turned on so the coil dont get hot if you just wanna use lights or listen ro radio etc etc.

UNMARKED or raised center terminal often feeds the starter solenoid (via any neutral safety switch etc) and its hot ONLY when youre down in the held turned spring position to start the cranking motor.

This is for one of those switches where you turn it to the max right CW position and against spring pressure to engage the starting motor

John T Nordhoff in Indiana, retired electrical engineer

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