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Briggs-Fan
Briggs-Fan, Small Engine Technician
Category: Small Engine
Satisfied Customers: 1228
Experience:  over 15 years experience in small engine repair, multiple certifications
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I have a Cub Cadet SLT 1550. Some kids stole it one night

Customer Question

I have a Cub Cadet SLT 1550. Some kids stole it one night and pushed it into a creek. Cleaned it up, changed the oil, etc... Ran fine for about a month, now it won't start. Don't know if it is related. Key will not engage the starter. Battery is good, bench tested the starter, good. I can use a hot wire from batter to starter and it turns just fine. I suspect it might be a safety switch. I know of three, The seat, the brake and the blade engage switch. How can I test these?
Submitted: 6 months ago.
Category: Small Engine
Expert:  JON replied 6 months ago.

Hi, my name is ***** ***** me review the issue, and I will be more than happy to help resolve it as quickly as possible.

Expert:  JON replied 6 months ago.

Use a meter to test for continuity of the switches. Most likely it is the seat switch if it is a switch. What happens when you turn the key? Have you tested the solenoid and tried jumping it for starting power?

Customer: replied 6 months ago.
I have disconnected the seat safety switch, no effect. I have jumped from the battery to the solenoid connection, and the motor turns over just fine.
Expert:  JON replied 6 months ago.

It will turn over just fine or will it start

Customer: replied 6 months ago.
It didn't start
Customer: replied 6 months ago.
The PTO switch has 7 polls, how do I test it?
Customer: replied 6 months ago.
But I didn't think it would start, and was only testing the solenoid function. I actually didn't pull choke and try to start, I thought the voltage was actually lower for the solenoid and didn't want to damage it.
Expert:  JON replied 6 months ago.

lock brake and try to start machine using the solenoid jump. if it starts, let me know if it turns off by the key?

Customer: replied 6 months ago.
I will try it, it will be several minutes
Expert:  JON replied 6 months ago.

not a problem. I am off/on here all day long

Customer: replied 6 months ago.
Ok, ran into a little problem. It's been 2 months since I worked on it, and the battery is down. Had a hip replaced and couldn't bend to work on the mower. Anyway, the batter is down some, and the solenoid clicks hard, but the engine will not turn over. I put a charger on it, and it will take a while.
Customer: replied 6 months ago.
Clicks hard with the jumper from the battery, still nothing from the switch alone.
Expert:  JON replied 6 months ago.

Fuse is good correct?

Customer: replied 6 months ago.
I found only 2 fuses, and they were both good. Is there more than 2?
Customer: replied 6 months ago.
I did remove both plugs, to ensure it couldn't possibly be a hydraulic lock.
Expert:  JON replied 6 months ago.

2 should be all.

seat switch or ignition switch. can you test the seat switch for continuity?

Customer: replied 6 months ago.
The seat Switch is "open" when seated, and "closed" when seat is empty. I disconnected the seat switch leads.
Customer: replied 6 months ago.
I can find three safety switches. One on the PTO safety switch cutoff, a brake switch cutoff, and a seat switch cutoff.
Expert:  JON replied 6 months ago.

will need to test the other 2 as well

Customer: replied 6 months ago.
Ok more updated information. Seat Switch, closed - unseated, must be corroded, no continuity, seated, no continuity. I would think this is not a problem, because seated is open.
Had miltimeter in hand, test battery had 12.5 volts, so battery is not down. Double checked the hot terminal on the battery, clean. I do not know how to test the PTO safety switch.
Customer: replied 6 months ago.
Just a passing thought/ question. If the PTO is engaged, engine would not turn over when jumped from battery, but solenoid would click, and key would not engage the starter, because of the safety switch, correct?
Expert:  JON replied 6 months ago.

if you have no continuity then it will not work and the switch needs to be replaced

Expert:  JON replied 6 months ago.

if PTO is engaged, machine will not start either

Customer: replied 6 months ago.
Seat switch, can you explain. Your explanation doesn't match my understanding of the machine. It is a very simple switch, unseated, the contacts touch, if seated the contacts do not touch. That would tell me it needs to be open to start run, correct?
If there is no continuity when seated, I would think the switch would be in the (ok to start) mode.
Customer: replied 6 months ago.
Any thoughts on my statement, above?
Customer: replied 6 months ago.
Jon, are still on the case?
Expert:  Briggs-Fan replied 6 months ago.

Hi. , my name is ***** ***** well and welcome to Just Answer , I'm really sorry Jon opted out of your question without telling you , let me review all you have done so we can find out what it could be

Expert:  Briggs-Fan replied 6 months ago.

How many blades does your seat switch have ?

Customer: replied 6 months ago.
The seat switch, is not a normal switch, but rather two connections to the wires, and your description of blades is appropriate. At the point of contact, there is 3 blades. It appears a ground, and one blade for each wire. When unseated, all three contacts are together. When seated, the two wired blades are separated. I didn't see your email (from yesterday) until this morning.
Expert:  Briggs-Fan replied 6 months ago.
When the seat button is depressed it should have continuity
Customer: replied 6 months ago.
I am not sure you understand the seat switch on my mower. Give me a moment, and I will send you a picture.
Customer: replied 6 months ago.
I attached a close up picture of the switch. This is the normal position with "seat empty"
Expert:  Briggs-Fan replied 6 months ago.

Right , so when you sit on the seat the 2 metal parts touch making connection allowing the coil to produce spark

Customer: replied 6 months ago.
Actually, just the opposite, when you sit on the seat they are separated, do not touch.
Expert:  Briggs-Fan replied 6 months ago.
Can you get to the coil on the engine ? , if you disconnect the ground wire from the coil you can check for spark .
Customer: replied 6 months ago.
It has a magneto, It doesn't have a coil.
Customer: replied 6 months ago.
Are you somewhat familiar with a Cub Cadet SLT 1550?

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