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Tec OVRM120 No Spark


edge10's Avatar
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05-28-10, 08:46 PM   #1  
Tec OVRM120 No Spark

This happened just after a hot start. I haven't had time to do more than just a few quick tests. The factory service manual says special test equipment is need to test the ignition module. Is there a way to test this with a DVOM? Is there anything in the kill switch circuit that typically fails. This is on a Scotts mower with electric start.

 
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05-29-10, 09:57 AM   #2  
Unplug the kill wire from the coil and test for spark again. If still no spark, the coil is bad.


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

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05-29-10, 12:40 PM   #3  
Is the trigger coil replace as part of the secondary coil assy? If not is there a way to test - maybe voltage pulse? Do you recommend Tec OEM parts or aftermarket such as Stens?

 
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05-29-10, 01:11 PM   #4  
Trigger coil? There is only one coil/solid state ignition module assembly part# 3443B to contend with.

"Any way to test?" That's what I'm saying, this is how to test it. You don't have to worry with voltage pulses and resistance readings or any of that stuff, just unplug it and test. If no spark with the kill wire unplugged from the coil, a good plug, and .010" air gap, then it is bad... undoubtedly, certainly, and for sure.

I prefer OEM parts, especially with coils.


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05-29-10, 02:47 PM   #5  
Yep, my OVRM120 - 22043E has what looks like a trigger coil screwed the right of the ignition coil. There is a capacitor and resistor under a plastic cover as part of the circuit. I checked the Tec parts break down and it does not show a separate trigger coil. It lists just the 34443C as Solid State Ignition, which has no trigger coil as you said. There is no spark with the kill wire pulled.

Maybe this be a generator for the battery? It was not suppose to have this feature, it came with a wall charger. The batt dies eventually and needs charging. I only get 80 mV when I pull the recoil and the manual says the ignition trigger coil needs 200 V. But if the supercede 34443C coil does not include a separate trigger then I guess it does not matter.

 
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05-29-10, 03:34 PM   #6  
The coil you see mounted with the armature is a charging coil for the battery. Even though it has a wall charger, electric start engines (even the push mower engines) have a tiny low amperage charging coil like you're looking at. It doesn't affect the spark, and you will want to reinstall it with the new ignition coil.


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

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06-01-10, 07:59 AM   #7  
Thanks for confirming the batt armature. Wiring for this armature goes to the batt/starter switch as it should.

Are non-resistor plugs OK for the reliability and operation with this ign coil? I know some solid state ign will not run correctly with a non-resistor plug. I plan on getting a new plug and sometimes the resistor plugs are not available.

 
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06-02-10, 07:01 AM   #8  
Error in posting - ignore


Last edited by edge10; 06-02-10 at 07:03 AM. Reason: Error
 
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06-02-10, 06:18 PM   #9  
Resistor plugs not available? Almost all plugs made and sold today are resistor plugs. Some places don't sell non-resistor plugs at all, even if you wanted one. Regardless, you can use either if you want.


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06-02-10, 09:09 PM   #10  
Replaced the ign module and it fired right up. New module part number 34443D replaced 34443C. The only difference I see is a slight change to spark plug lead, internal components is a ???. Thanks for the help.

 
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