1992 Ford 3930 I had it running, shut it off and when I got back on it, turn the key and nothing. So made sure it was in neutral tried again nothing. I then jumped the solenoid (relay) and it fired up. Bought a new starter, since I couldn't just by solenoid, put new starter on and same problem, lights up won't start but I can Jump across solenoid and it starts. Checked wire to solenoid it's good battery cables are good soooo could it possibly be the ignition switch? Or should I be looking some place else? Thks
- Thread starter marmon77
- Start date
Bern
Well-known Member
- Location
- Mount Vernon, WA
Sounds like the neutral safety switch to me. Some of those 3-cylinder switches are very sensitive to finding
the "sweet spot". Jiggle the shift lever while you hold the key switch to the start position. It just might
take off.
the "sweet spot". Jiggle the shift lever while you hold the key switch to the start position. It just might
take off.
PatsTractor
Member
If you know you have juice from battery to the ignition switch prior to attempting to start the tractor...
Stick a test light on the ignition switch S terminal.
Turn the key all the way like you are attempting to start the tractor and see if you are getting juice out of the ignition switch at the S terminal (start terminal)
If you aren't / change the ignition switch.
If you are..
Stick a test light on the solenoid small wire that comes from the ignition switch
Turn and hold the key to the start position and see if you have juice at the solenoid
If you do...and tractor doesn't spin over suspect the solenoid, or bad connection at solenoid.
If you don't suspect the ignition switch, neutral safety switch like the gentleman mentioned or a loose or faulty/broken wire between ignition switch and selenoid.
Right now if you can start the tractor by jumping the solenoid then you are not getting juice to the S terminal at the solenoid.
During testing of the starter system keep yourself, whoever is helping if anyone... long hair, loose clothing, and jewelry such as long gold necklaces clear of moving parts..
Safety First right!
Stick a test light on the ignition switch S terminal.
Turn the key all the way like you are attempting to start the tractor and see if you are getting juice out of the ignition switch at the S terminal (start terminal)
If you aren't / change the ignition switch.
If you are..
Stick a test light on the solenoid small wire that comes from the ignition switch
Turn and hold the key to the start position and see if you have juice at the solenoid
If you do...and tractor doesn't spin over suspect the solenoid, or bad connection at solenoid.
If you don't suspect the ignition switch, neutral safety switch like the gentleman mentioned or a loose or faulty/broken wire between ignition switch and selenoid.
Right now if you can start the tractor by jumping the solenoid then you are not getting juice to the S terminal at the solenoid.
During testing of the starter system keep yourself, whoever is helping if anyone... long hair, loose clothing, and jewelry such as long gold necklaces clear of moving parts..
Safety First right!
Destroked 450
Well-known Member
- Location
- Harned, Ky
Check the pto lever, 3930 has a pto safety switch, also has a fuse in the fuse box for the starter relay circuit.
Waisted your money replacing the starter, when you jumped the solenoid and the tractor started that told you the starter and solenoid were working.
Larry NCKS
Well-known Member
It told him the starter was working. It didn't say boo about the solenoid.
Destroked 450
Well-known Member
- Location
- Harned, Ky
If you jump from the battery stud across to the start post on the solenoid and the starter cranks the engine, that means both the solenoid and starter are working.
If you jump across the battery stud to the starter motor stud the starter motor might spin but the engine won't crank over because the solenoid hasn't engaged the starter drive.
Thks for the responses. I agree, wasted money on starter. Never even thought about ign. switch. I have ordered a new switch so I will be trying that when it gets here. I did check the wiring to the solenoid and the connection, they looked fine. Thanks again for the advice. I will keep you posted.
Thks for the responses. I agree, wasted money on starter. Never even thought about ign. switch. I have ordered a new switch so I will be trying that when it gets here. I did check the wiring to the solenoid and the connection, they looked fine. Thanks again for the advice. I will keep you posted.
marcusmerritt
Member
I have to put the transmission in neutral, turn the key and, at the same time, jiggle the high/low lever to hit the sweet spot on my diesel 2000. Once I hit that sweet spot, it cranks right up. Probably could replace the neutral safety switch but, now that I know the where the sweet spot is, no need to. I call it an anti-theft device.
Destroked 450
Well-known Member
- Location
- Harned, Ky
Later models including your 3930 have a s-it pot load of wires running back and forth.
Get a meter and start testing the circuit at it plug in points, ignition switch, trans natural safety switch, pto safety switch, fuse, ice cube relay, starter solenoid.
Do you have a wiring diagram?
Yes i jumped the gun and just ordered parts.
I finally startd testing different circuits. Turned out to be the "ice cube" relay switch in the wire loom.
No I do not have a wiring diagram.
I ran a jumper wire from one side of the relay to the other and tractor started.
Is that just a standard relay I can get at any parts store?
I finally startd testing different circuits. Turned out to be the "ice cube" relay switch in the wire loom.
No I do not have a wiring diagram.
I ran a jumper wire from one side of the relay to the other and tractor started.
Is that just a standard relay I can get at any parts store?
Yes i jumped the gun and just ordered parts.
I finally startd testing different circuits. Turned out to be the "ice cube" relay switch in the wire loom.
No I do not have a wiring diagram.
I ran a jumper wire from one side of the relay to the other and tractor started.
Is that just a standard relay I can get at any parts store?
I finally startd testing different circuits. Turned out to be the "ice cube" relay switch in the wire loom.
No I do not have a wiring diagram.
I ran a jumper wire from one side of the relay to the other and tractor started.
Is that just a standard relay I can get at any parts store?
Destroked 450
Well-known Member
- Location
- Harned, Ky
Should be a standard relay, just match up the blades and amperage.
Most relays are 30 amp.
See if it has the NH numbers on the case, if so they can be crossed.
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