starting problems on scotts 1642s

[sox3]

The relay operates like a solenoid. I can test them, but I dont know if you can. Google it and see what comes up. I
would be willing to bet that the wire from the Ignition switch does not go direct to the solenoid. It probably goes thru a safety switch or two, maybe the relay also. Have to google or contact the mfg for a diagram. If you have the manual for it, check there. Need the model # off of the unit. I could research it if you would post it.

 

[sox3]

Found this on line, hope it helps



If your relay is normally closed, 30>87 should be zero. If normally open, it should be infinity.

If it is dual , 30>87A is normally closed, while 30>87 is normally open. This will reverse when the relay is energized.



Another way, is to simply put 12V power across 85 and 86. You SHOULD hear a very distinctive click as the coil pulls the internal switch over from 87A to 87. Then measure 30 to 87 (should be around 0)and 30 to 87A (should be ALOT). Power off, and the measurements should be just the opposit.


That being said, the fastest way to check a relay is to just jump the coil across a battery, and listen for the click. You can use the multimeter to check for continuity across the switch

 

[toohott7718]

Ok, I took off all the safety switches and tested all of them, they all tested out good. I looked at my test light and I thought when it lit up green it meant it was power, I was wrong. Red is positive and green is negative. I put back all the safety switches and tested voltage at the ignition. It seemed to be bad, so I replaced the ignition, and still wouldn't start.
I put my test light on the red wire at the ignition and it showed a very faint red light. I pulled on the red wire and it goes straight to the battery. So I got a scrap peace of wire and ran a new power wire to the fuse that runs to the ignition and I turned the key and it started.:cool2:
I'm not really sure how a wire that is ran through a channel with other wires went bad but I guess anything is possible.
Thank you everyone for all your hard work and suggestions, I really appreciate it.:thumbsup:

 

[sox3]

Glad you finally got it solved. I know we use to find bad wires on MTD machines where the deck lift linkage would rub through the wires and short out.

 

[toohott7718]

yeh its funny on the body of the mower there is this channel that the wires go through, no moving parts to rub against them. I guess crazier things have happened. thank you again for all your help