53 super H
Member
My super H cranks over good and will not fire until you let off starter. What do I need to check? Has been changed to 12 volt.
- Thread starter 53 super H
- Start date
16-30 oilpull
Member
could be a weak coil
teddy52food
Well-known Member
Is the resister by pass working?
Roger Tomfohrde
Member
Does this have the circuit that when the starter is engaged the power to the coil bypasses a resistor? there may not be power to the coil when the starter is engaged. I know newer IH had that function.
If you have a 2nd battery, try wiring one battery just for the coil, and the other for the starter. Sometimes the starter "steals" enough power from the battery that the coil does not get enough to make good spark. Another test is to check the voltage across the terminals of the battery while cranking. If this voltage drops a lot (say, from 12 down to only 5 or less), then perhaps the battery is weak, old, or under-sized. Could also be a weak coil as oilpull says.
Janicholson
Well-known Member
If it has a ballast resistor for the coil a simple bypass can increase the coil voltage while starting. Use a simple on off switch to bypass the resistor when starting. Then turn it off so the resistor is working when the engine starts.
Another thought is that you have a 12v no resistor required coil with a resistor in the circuit. Take out the resistor (read the label on the coil first) and it might just be fixed.
Another issue can be a bad ignition switch. that acts as a resistor. Jim
Another thought is that you have a 12v no resistor required coil with a resistor in the circuit. Take out the resistor (read the label on the coil first) and it might just be fixed.
Another issue can be a bad ignition switch. that acts as a resistor. Jim
Janicholson
Well-known Member
None on and H. Jim
Janicholson
Well-known Member
None on an H. Jim
Roger Tomfohrde
Member
None standard is correct but we don't know who converted the tractor to 12 volts , It may have all kinds of changes made.Just sayin
Brownie450
Member
Connect a Volt meter to the cables on the battery--- not
the battery posts. Read Voltage while cranking the
engine.
Next, connect the Volt meter to the battery posts & read
Voltage while cranking the engine.
If there is more than 1/2 Volt difference, between the
readings, check battery post to battery cable for corrosion
or a high resistance.
Check ALL wiring & terminations heading to the coil & the
short wire from the coil to the distributor.
Also check that the grounds everywhere are clean & tight.
Jim
the battery posts. Read Voltage while cranking the
engine.
Next, connect the Volt meter to the battery posts & read
Voltage while cranking the engine.
If there is more than 1/2 Volt difference, between the
readings, check battery post to battery cable for corrosion
or a high resistance.
Check ALL wiring & terminations heading to the coil & the
short wire from the coil to the distributor.
Also check that the grounds everywhere are clean & tight.
Jim
BarnyardEngineering
Well-known Member
- Location
- Rochester, NY
What's really happening is when the starter is cranking the engine, there is a voltage drop at the battery. Thus not enough voltage is being passed to the coil to allow it to create a spark. As soon as you let off the starter, the voltage pops back up, the coil charges up, and as the engine coasts through a compression stroke, it sparks, fires, and runs.
The fact that it does that means you have the tractor tuned up pretty well and your starting technique down to a science.
Things people mentioned before are all potential causes of the issue. In addition, the starter could be contributing to the problem. If the starter is badly worn, or damaged, it will cause a low voltage issue. Many 12V conversions are done because the starter needs repair.
The fact that it does that means you have the tractor tuned up pretty well and your starting technique down to a science.
Things people mentioned before are all potential causes of the issue. In addition, the starter could be contributing to the problem. If the starter is badly worn, or damaged, it will cause a low voltage issue. Many 12V conversions are done because the starter needs repair.
teddy52food
Well-known Member
My H has one after being changed to 12 volts.
53 super H
Member
Thanks everyone. Replaced coil with one that has built in resistor and problem solved. Just barely hit starter and fires right up.
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