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Old 05-06-2012, 07:09 PM   post #1 of 9
mikeginob
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Default Snapper interlock module testing?

Any know how to test a snapper interlock module like part #7063064 or 28606? My model is a 331518KVE.
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Old 05-07-2012, 11:55 AM   post #2 of 9
tomw0
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Default Re: Snapper interlock module testing?

I figured out a wiring diagram by following the colored wires, and figured out what the little black thingy was... But. Not what was inside. The symptom(s) of a failing interlock that I am aware of is intermittent miss, and/or 'stuttering' as you are mowing at full throttle. Sometimes the mower would quit completely, and then restart as if nothing were wrong. If it fails fully, you won't be able to start the mower.
To test if the interlock is causing miss or stalling, replace or disconnect it. I don't know of another test you can perform, as it is a 'solid state' latch, that stays latched until one of the inputs is disconnected or grounded. If your symptoms are the engine coming to a stop, after starting and running for a while, then replace it to see if that is the cause. As the rules of the site state, details on how to disconnect it are not given. You must know what you are doing to find it, and then do anything with it.
tom
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Old 05-07-2012, 02:28 PM   post #3 of 9
dc 3mech
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Default Re: Snapper interlock module testing?

I have never seen a schematic or diagram for an "interlock module" and might suggest substituting a known good or new module.It works by grounding out the ignition when the switches are not in the proper positions.
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Old 05-07-2012, 02:38 PM   post #4 of 9
dc 3mech
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Default Re: Snapper interlock module testing?

The 7063064is a replacement module for B&S engines,and for the modules on "series 14 and earlier" mowers with B&S engines,and includes the plug and wiring.
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Old 05-07-2012, 02:57 PM   post #5 of 9
G-1
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Default Re: Snapper interlock module testing?

In case you don't have a wiring diagram, the sears site has one:
http://www.searspartsdirect.com/part...dMod=331518KVE

I see the module is $42.60 there...maybe less expensive elsewhere?

But, before you buy a module you probably should do some testing. The interlock module only has 4 wires and one is ground. It should not be difficult to see what is not working. Once you find out what is wrong, you may be able to duplicate the function with a simple relay for a lot less than a new module.

Gerald
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Old 05-07-2012, 10:31 PM   post #6 of 9
mikeginob
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Default Re: Snapper interlock module testing?

Thanks for the replies! I guessed I should have stated what the mower was doing also. I am using recoil start to crank it right now. After starting the mower, I release the parking brake the mower will die. I got the wiring diagram for it from partstree.com and thought it must be the pedal switch but the NO and NC contacts seem to work properly depending on the pedal position. I checked the deck switch and it seems to work OK also. I couldn't find a seat switch but I did find where the yellow and brown wire that connect to the seat switch and they were connected together. Not sure if some of these mowers had seat switches or previous owner bypassed it or what. I did a resistance check on the interlock module as I was running out of things to check by checking all the combinations of terminals. On mine the blue wire and green wire have zero resistance. All of the other combinations I tried were open circuits. I may have a wire some where that is grounding it out I suppose. I will have to wait until next weekend to due further troubleshooting so I thought I would see if you guys had ever seen this before and what the cause might be..... Again everything works properly other than when you take your foot off the brake it dies.

-Mike
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Old 05-07-2012, 11:34 PM   post #7 of 9
G-1
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Default Re: Snapper interlock module testing?

Mike, it looks like the pedal switch is not connected to the seat sw. when the pedal is depressed. I presume this is so the recoil start can be used with no one in the seat. As soon as you get it started and then let the pedal up, the seat sw. comes into play. It is designed so that the circuit through the seat sw. is opened if the seat is occupied. And it looks like if the sw. is missing, the circuit is closed and that puts ground on the ignition (magneto).

So, you need to resolve the seat sw. function and go from there.

Gerald
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Old 05-08-2012, 12:09 PM   post #8 of 9
dc 3mech
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Default Re: Snapper interlock module testing?

The forum is pretty touchy about talking about "safety systems" even for trouble shooting.I think the "seat switch" would be a good bet,since a PO has obviously done something to it.I believe I read somewhere that the seat switch connector can't be dis-connected to take the switch out of the system,its spring loaded,or something.
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Old 05-08-2012, 12:50 PM   post #9 of 9
tomw0
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Default Re: Snapper interlock module testing?

Take my wandering thoughts with a grain of salt as my Snapper is about 20 years old, series 8, I think, and has very little in common with the diagram at SearsPartsDirect. The module in mine, if memory works at all, is cylindrical, resembling a turn signal flasher.
The machine also is bereft of seat switches. FWIW, I think seat switches cannot be jumpered because they provide ground to the starter solenoid, or ground to the ignition, depending. You won't get cranking, or you won't get fire, take your pick, if you try to remove them from the circuit without doing more 'wiring'.
tom
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