John Deere 2010 wont start

TRMAC · Jan 2, 2011

I checked the Coil it has no resitance complete short. I am going to replace the coil.Thing is I have a 12 volt battery and the coil that was on it si 6 Volt . When the coil is connected I measured 4 V at the battery side and when I disconnected it I measure 12 Voltss. Do I get a 12 volt coil or stick with the six volt?

JDemaris · Jan 2, 2011

Are you saying you put an ohm-meter between the two small terminals on the coil (with ALL wires unhooked) and got a zero reading? Or did you get a "highest it will go" reading?

"Zero" , i.e. NO continuity means an open-circuit - not a short. Full continuity, i.e. no resistance will be a short as long as you're not trying to check it with all the wires still hooked to the coil. Leaving those wires hooked up will give you a false reading.

2010 uses what many call here a "6 volt" coil. When new, it used a ballast resistor built into the ignition switch. Later, if repaired, a new parts kit put a new separate resistor in outside the key switch.

Bob · Jan 2, 2011

It's UNCOMMON for the secondary to completely short to the point you would "see" it as a short with an Ohmmeter.

If the coil primary is REALLY shorted, you would have a HOT coil, burnt breaker points overheated ballast resistor, ignition switch, and wiring. Are you noticing any of those problems?

How did you check the coil to determine it is shorted?

Jerry/MT · Jan 2, 2011

Infinite resistance is a complete short. Zero resistance is a closed circuit.

When you measured the 4 V were the points closed? If they were, you have high resistance in that part of the circuit.

Measure the resistance on the coil across the two small terminals again and report on what you find.

Jerry/MT · Jan 2, 2011

One way to get the primary part of the circuit on battery side out of the picture is to run a jumper from the battery directly to the battery side of the coil and then check for spark. if you don"t get a spark then, it"s the coil or the circuit to the distributor to ground that"s the problem.

Kentb of SWMO · Jan 2, 2011

On a OHM METER a reading of ZERO, meter needle all the way to the right if it is an analog meter, tells you there is a connection between the two measuring points. Infinity, needle all the way to the left tells you the connection is OPEN. NOTE: Most coils are auto-transformer. The two low tension terminals WILL measure some where in the ONE OHM range which looks like a SHORT. The high tension terminal, the terminal the coil wire comes from will measure somewhere around 10 Kilo ohms to EITHER of the low tension terminals.

Kent

keh · Jan 2, 2011

I had a 2010 gas with starting and running problems and it turned out the switch was bad.

KEH

Bob · Jan 2, 2011

THINK about what you just typed... "Infinite resistance is a complete short."

That's NOT quite right!

souNdguy · Jan 2, 2011

infinite resistance is 'open'.. 0 resistance is closed ( could call it a short if it's in the wrong palce too.. )

soudnguy

John Deere 2010 wont start

TRMAC

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JDemaris

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Bob

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Jerry/MT

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Jerry/MT

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Kentb of SWMO

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keh

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Bob

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souNdguy

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