8n wont start/even turn

Brian-Ohio · Aug 11, 2013

1950 8n that I can pull start but when I push the button to try to
start it nothing happens. Bad button or problems with the starter?
Or maybe something else?

Royse · Aug 11, 2013

Lots of possibilities here.
Your original push button supplies ground to the solenoid to crank.
You can simply hook a wire to the chassis and touch it to the small
wire on your solenoid to see if it will roll over, eliminating the push button.
MAKE SURE IT'S IN NEUTRAL THOUGH!!!
If that doesn't work, your can use a pair of jumper cables and connect
both of the big lugs on the solenoid together to see if it will roll.
Again, in neutral.
You can also use a 12V battery to jump it, connecting one lead to
the starter post and the other to the chassis quickly.
Not jumping directly to the battery and again in neutral.
I have found many bad solenoids, or maybe even more common, a
solenoid bought from a car parts place that is a three wire, but
is made for negative ground and does not work with the 8N tractor.

ericlb · Aug 11, 2013

first thing is check the starter button, put tractor in nutural, if the electrical system hasnt been modified a factory setup grounds the circut when you puish the button and they do fail to make contact, uncover the end of the wire and ground it to the transmission, withthe key on and the clutch down for safety if it starts the button is bad, if not check to make sure the wire is not broken between the button and the solinoid, if its ok its likly a starter, this all sort of depends on just how your tractor is wired, factory 6v positive ground 12v conversion, or something in between

old · Aug 11, 2013

Well your lack of info makes it hard to help you. Things like 6 or 12 volt front or side mount. Just guessing I would say you have bad battery cable connections or a bad solenoid or a weak battery. If you take a heavy jumper and cross the 2 big posts on the solenoid and it spins over then the start is good and your problem is from there back. If it does not spin over then the start is bad or the battery is weak

Anonymous-0 · Aug 12, 2013

Loose battery connection.

El Toro · Aug 12, 2013

If you have a starter solenoid similar to this one in the picture place your tranny in neutral with the brakes set. Use a screwdriver to short across the small terminals to see if the engine will crank. Make sure all your battery connections are clean and shiny and that includes where your battery is grounded. Hal

rvirgil_KS · Aug 12, 2013

The solenoid does not care about ground, it will work either positive or negative.

The Ford solenoid is powered internally by a connection to hot battery connection and activates by ground to the small top post.

Other type (they may look the same) is powered via the small top post and is grounded internally in the solenoid.

rvirgil_KS · Aug 12, 2013

This type solenoid can be one of two configurations.

1.The activating coil is internally connected between the two small posts. Power to one side and ground to the other. Switch can be on either side.

2. Coil powers to one post and when activated supplies 12 volts to other post which goes the to ignition coil to bypass resistor in some 12 volt configurations to give hotter starting spark.

Shorting small terminals on on either should not make it activate. If you short coils on #1 with switch on and start button pressed you will be shorting across the coil and make lots of sparks.

Royse · Aug 12, 2013

(quoted from post at 09:14:23 08/12/13) The solenoid does not care about ground, it will work either positive or negative.

True statement, if you have the right solenoid or change the wiring to match the solenoid.

What I was referring to are the 3 post solenoids where power is applied
to the small post and ground is supplied via the solenoid mounting bracket.

Since the push button supplies ground, not power, those solenoids
will not work with the original wiring. The activating coil has
ground connected to both sides when the button is pressed, so
they simply do nothing at all, just as described by the OP.

It would probably be difficult to mount one on the 8N starter anyway.

One other possibility is that the solenoid is mounted on the starter
backwards. i.e. small post out instead of in towards the block.

showcrop · Aug 12, 2013

Get a meter or even just a continuity light so that you can see where you have voltage and where you don't. Then just remember that a component is not guilty unless it is getting power and still not working.

8n wont start/even turn

Brian-Ohio

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Royse

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ericlb

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old

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Anonymous-0

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El Toro

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rvirgil_KS

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rvirgil_KS

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Royse

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showcrop

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