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john deere 40 starter switch

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vidaliaman

06-21-2018 12:14:36




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my john deere 40 has been wired by the prior owner 6v negative ground and has been running just fine, however i wanted to put a new starter switch on it so i ordered from yesterdays tractor switch and it seems to arc on the pull rod, so i took the new one off and put back the old one and no problem other than it's a bit rusty and sticks when pulling
do i have a faulty starter switch?
and i'm going to wire back to positive ground, do i need to just swap the coil wires?

dave
michigan

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James Howell

06-21-2018 14:01:59




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 Re: john deere 40 starter switch in reply to vidaliaman, 06-21-2018 12:14:36  
"it seems to arc on the pull rod"

You might consider inspecting the insulation on the inside of the switch.

Take a look at the photos below.

third party image

Make sure the copper stud on the push button does not come in contact with the two sides of the metal housing.

third party image

Make sure the end of the push button does not come in contact with the copper stud.

third party image

Make sure the copper stud connected to the battery cable does not come in contact with the inside of the metal housing.

"do i have a faulty starter switch?"

IF the new switch "seems to arc on the pull rod" AND you "took the new one off and put back the old one and no problem", THEN the new switch could be a faulty starter switch.

"i'm going to wire back to positive ground, do i need to just swap the coil wires?"

Yes.

Take a look at the Lamps and Ignition Wiring diagram below.

third party image

On the POSITIVE ground electrical system, note the BLUE wire from the IGN terminal on the ignition switch is connected to the NEGATIVE terminal on the coil.

You will also need to polarize the generator after swapping the battery cables.

When and How to Polarize a Generator

Polarization is a procedure which matches the polarity for the generator and the voltage regulator by permitting a surge of current to flow through the generator, correctly polarizing it.

Damage to electrical components can occur if polarities do not match.

Polarization of the generator should take place whenever any of the following events occur: 1. The battery is replaced or disconnected from the tractor 2. The generator is replaced or serviced 3. The regulator is replaced or serviced

If any of these events occurred, do not start the engine until polarization is done. The polarity of the generator must be set to match that of the voltage regulator.

Take a look at the photo below of the starting motor.

third party image

Make a jumper wire (14 or 16 gauge) and put alligator clips on both ends.

Polarize the generator on a Model 40 by using the jumper wire and momentarily jumping from the NEGATIVE battery cable on the starting motor over to the ARM terminal on the generator to get a small spark.

third party image

Hope this helps.

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vidaliaman

06-21-2018 14:48:30




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 Re: john deere 40 starter switch in reply to James Howell, 06-21-2018 14:01:59  
thanks for all that information that is great!!! i put the new switch back on and found continuity from the stud to the case with out the button pressed, i inspected it and all looks well insulated but it has to be a bad switch doesn't it?
thanks again
dave



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James Howell

06-21-2018 15:31:18




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 Re: john deere 40 starter switch in reply to vidaliaman, 06-21-2018 14:48:30  
"found continuity from the stud to the case with out the button pressed"

Probably need to exchange it for another one if possible.



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