Crafstman 536.881800 on/off switch will not turn off - Snowblower Forum : Snow Blower Forums
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post #1 of 13 Old 11-29-2019, 03:49 PM Thread Starter
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Crafstman 536.881800 on/off switch will not turn off

Hello,

There is snow expected on Sunday so today I pulled the snowblower out of storage, changed the oil, and gassed it up. It is more difficult to start than it used to be but I got it going in the end. When I went to turn it off, I flipped the switch to off and nothing happened. It took me quite a while fooling around with the choke and the throttle to get it stopped.

What can I do about this? I assume I can replace the switch but I probably need to use this on Monday. Can I hotwire the switch for now?

LMHmedchem
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post #2 of 13 Old 11-29-2019, 04:02 PM
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If I recall, that uses a little rocker switch. You can use a temporary switch. All it does is ground the coil, to kill the engine.




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post #3 of 13 Old 11-29-2019, 04:03 PM Thread Starter
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Originally Posted by Motor City View Post
If I recall, that uses a little rocker switch. You can use a temporary switch. All it does is ground the coil, to kill the engine.
What would I use for the temp switch and where could I get it today or tomorrow?

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post #4 of 13 Old 11-29-2019, 04:23 PM
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broken wire connection at the switch or along the wires

Bought a dead but now fixed 1980ish craftsman II 10/28....ITS ONE HEAVY BEAST

MY VIDS ON FIXIN HER UP

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post #5 of 13 Old 11-29-2019, 05:16 PM Thread Starter
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Originally Posted by vinnycom View Post
broken wire connection at the switch or along the wires
The switch feels a little soft, so the switch itself may not be working anymore. I guess I need to take it apart and see if there is an issue with the wires. If not, I will take the switch to an electronics store near here and see if I can get a replacement. I assume this is just a single pole single throw switch.

Does anyone know of a video about replacing the switch or do I just need to start pulling the plastic off until I can get to it?

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post #6 of 13 Old 11-29-2019, 05:49 PM
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I'm not familiar with that model so just speculation here. Earlier Tecumseh's had a wire that ran from points through a switch to ground. Throwing that switch grounded out the points, don't know if that applies to yours or not. One thing though you could do is put a gas line shutoff on the engine. even with switch issues, shutting off the gas would kill the engine in short order.

Just a thought.
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post #7 of 13 Old 11-29-2019, 08:00 PM
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Quote:
Originally Posted by LMHmedchem View Post
What would I use for the temp switch and where could I get it today or tomorrow?

LMHmedchem
You could go to an auto parts store and get a toggle switch and make a a harness with some crimp connectors.




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post #8 of 13 Old 12-12-2019, 11:03 AM Thread Starter
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Originally Posted by Motor City View Post
You could go to an auto parts store and get a toggle switch and make a a harness with some crimp connectors.
It turns out that this could hardly have been easier. I took out the old switch to get the specs and then went to my local electronics store and got one of these,

PHILMORE SPST On-Off Snap-in Rocker Switch ($2.50)

The only fly in the ointment was that is was an hour round trip to the store. Quite possibly they would have had one at an auto parts store, but I knew they would definitely have it at this place so I just decided to make the trip and be sure.

All I had to do was remove the plastic cowling and pop in the new switch (which is retained by plastic spring clips). Fortunately, the wiring for the switch seemed to be fine so I pushed on the connectors and it works fine now.

This is an unfortunately rare case in engineering where a part seems to have been designed to be easy to replace. I was afraid that the switch would be molded into the cowling or something typically idiotic like that. We did get quite a bit of snow, so it was nice to get it fixed in time.

Thanks for the help,

LMHmedchem

Last edited by LMHmedchem; 12-12-2019 at 11:05 AM.
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post #9 of 13 Old 12-12-2019, 11:52 AM
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Originally Posted by tabora View Post
You can just run a wire from the top of the spark plug out of the boot, through any single pole single throw (SPST) On/Off switch to a ground point anywhere on the machine.
If you're saying to ground the HV lead going to the spark plug with a garden variety switch DON'T.
There are kilo volts (10 to 20KV) present at the plug and the switch may be good for 240 volts or less (maybe 24V or 120V). It may arc over at the switch and the plug may never fire. Also if the switch has a metal toggle handle, touching it may be a little too thrilling.
A sheet metal strap firmly connected to a metal engine part and able to be pushed down onto the top of the plug (any boot would need to be cut out or removed) would work also.
My $0.02
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post #10 of 13 Old 12-12-2019, 12:48 PM Thread Starter
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Originally Posted by burt8810 View Post
If you're saying to ground the HV lead going to the spark plug with a garden variety switch DON'T.
There are kilo volts (10 to 20KV) present at the plug and the switch may be good for 240 volts or less (maybe 24V or 120V). It may arc over at the switch and the plug may never fire. Also if the switch has a metal toggle handle, touching it may be a little too thrilling.
A sheet metal strap firmly connected to a metal engine part and able to be pushed down onto the top of the plug (any boot would need to be cut out or removed) would work also.
My $0.02
Herb
I read the specs on the switch I removed and it looked the same on the replacement. I could certainly get an OE rocker switch from Briggs & Stratton. They are not very expensive and now I have time to order. I am not sure exactly which switch to get.

Something like this looks right,




but I always have trouble finding engine parts. The part diagrams I have are mostly for the snowblower and not the engine. Since the same snowblower can come with different engines, how do I determine which part I need? I wrote down these numbers off of the engine, B&S OHV 12E114 0268 E1, but I'm not sure if those are the right numbers to identify it or not.

Looking up that engine number gives me this part,

Briggs and Stratton 795333 Rocker Switch ($10)

which matches the Amazon replacement part listing.

Is this the switch I need. I would be more comfortable with an OE part even though the replacement I got worked when I used it the other day.

LMHmedchem

Last edited by LMHmedchem; 12-12-2019 at 12:59 PM.
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