Craftsman R1000 (247.29000) surging and wiring issue.

jerry1977 · Jun 1, 2025

Got this unwanted lawnmower as freebie and cleanup carburetor which had choke open stuck and rusty, replaced spark plug and when repaired two cut wires green and yellow-white on safety seat cable switch I was able to make it run only when the gear is in reverse position.
Checked all switches for continuity and all seems to be fine. Not sure what then causes cranking only work if the gear is in reverse and safety seat wire has the internal small metal comb shorting the 4 wires. Surging seems to not affecting performance as the cutting and riding on higher rpm is fine. Would this be affected with the old gas in tank that I mixed up with some fresh or this maybe affected by the wiring issue I mentioned?
Attached is the wire to seat switch that was fixed.

Thanks

Jerry

Auto Doc's · Monday at 11:48 PM

Try Sears parts direct.com

jerry1977 · Tuesday at 8:32 AM

Auto Doc's said:
Try Sears parts direct.com

I can see part but thats not helps me to understand issue with the wiring. Seems that cranking works when the gear is in reverse so the spring switch completes somehow circuit. The wire that goes in is yellow/black strip. I have check it for continuity and that seems to be fine.

Auto Doc's · Tuesday at 8:47 AM

Check for a broken, loose or dirty ground in the harness. Often times a relay will function the opposite way if it is not getting a proper ground. This has an opposite operational effect on the circuits.

jerry1977 · Tuesday at 10:04 AM

Auto Doc's said:
Check for a broken, loose or dirty ground in the harness. Often times a relay will function the opposite way if it is not getting a proper ground. This has an opposite operational effect on the circuits.

I totally believe that's the issue since the small metal switch once shortened to ground closes circuit. But I did check the two ground green wires for continuity and they both good. I have found schema for this tractor and can upload it here if you not mind to look at it to see which one is this switch.
I am attaching this wire switch pic. I don't understand why is then only touching stick on reverse as if this works as intended you shouldn't be able to start it while in forward as well, which will not make contact.

Auto Doc's · Tuesday at 10:12 AM

jerry1977 said:
I totally believe that's the issue since the small metal switch once shortened to ground closes circuit. But I did check the two ground green wires for continuity and they both good. I have found schema for this tractor and can upload it here if you not mind to look at it to see which one is this switch.
I am attaching this wire switch pic. I don't understand why is then only touching stick on reverse as if this works as intended you shouldn't be able to start it while in forward as well, which will not make contact.

If it is what I think it is, that is a reverse implement cutout switch. That is there so the deck PTO shuts off whenever putting the mower in reverse.

If you have a starter relay with 2 small wires, try switching them with each other, then try to start the mower like normal.

jerry1977 · Tuesday at 11:56 AM

Auto Doc's said:
If it is what I think it is, that is a reverse implement cutout switch. That is there so the deck PTO shuts off whenever putting the mower in reverse.

If you have a starter relay with 2 small wires, try switching them with each other, then try to start the mower like normal.

Oh ok make sense that's does the job if reverse then I believe recalled the blade were off.
So you mean reverse the two on starter solenoid? Mine looks like one I am attaching

Auto Doc's · Tuesday at 2:48 PM

Switch the wires on the two small terminals, may possibly work, if not, then switch them back.

From what you described happening, there has been a ground switched over or possibly not connected for the harness.

jerry1977 · Tuesday at 4:53 PM

Tried and nothing. with the two swapped it will not energize starter even if it touches that spring wire. I have noticed that when I removed shortening pin in the seat safety connector then will not even crank if the gear is touching spring switch in the reverse. So definitely somehow it is not grounding. There is one ground that goes all the way to deck attached switch and from there is distributed via switches all over. see diagram

StarTech · Tuesday at 5:20 PM

Provided that wiring schematic is the correct one then the starter solenoid should engage when the deck switch closed, Pto Switch in off position, and the brake applied. The reverse switch has nothing to do the cranking other than killing the magneto while the engine running and you put the mower in reverse while the PTO is engaged,

Something is simply wired wrong and you need someone that knows how troubleshoot electrical problems. Plug and Play won't cut it. Admit you need some help from a knowledge person their hands on the mower. There is no shame asking someone to put their hands on the mower to help you out.

I have had many a DIYer come to my shop after spending a lot money trying to fix an electrical problem to only find something missed wired or fifty cent terminal bad.

Craftsman R1000 (247.29000) surging and wiring issue.

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