Safety switch problem on Husqvarna Z248F zero-turn mower

[Loose_Screws]

One problem. Jumping the switches that are NC (normal closed) would the same as you have not activated them or basically you are shorting to ground
and BTW the Black wire is the ground circuit and not the 12V positive circuit.

LOL, I was thinking that it didn't seem right that a black wire would be the power supply when I posted above. I'm pretty sure the green wire is the power supply.

 

[StarTech]

NO NO NO....Go back to school to learn how to read schematics.
.
You are dealing with a DC ground circuit. In the diagram. The black, green, orange, blue(lap bar switches interconnect), white wire are all DC- grounded in the safety system. Some are hard grounded and others are switched grounded. The whole purpose of this circuity is ground the safety relay, the starter solenoid, and the magneto (ignition coil) depending which switches are activated. The white wire is your magneto kill circuit. Now whoever drew the diagram does have the contacts of the lap bars switches closed when they are actually open in Park/Neutral position (outboard position). Also the relay contacts is also shown as if the lap bars are not in the park position and the relay is operating.

Now there is also one blue wire off the PTO switch that goes the PTO clutch that is a switched 12v+ circuit. Also the Purple wires are switched 12V+ off the "A1" of the ignition switch. One path is to the PTO switch for the PTO clutch and branches off to the Hour meter. Another Purple branch goes to the engine fuel solenoid and the safety relay. Again 12v+ switched circuit. These purple are hot 12v+ whenever the ignition switch is on or in the start position. Now the yellow wire is the switched starter solenoid trigger wire.

Now that safety relay can be a little hard to find if you don't know what you are looking for as it is taped or zip tied to the wiring harness or otherwise mounted.


This relay is not listed in the parts list but here is a list of part numbers for it.

 

[Loose_Screws]

One problem. Jumping the switches that are NC (normal closed) would the same as you have not activated them or basically you are shorting to ground
and BTW the Black wire is the ground circuit and not the 12V positive circuit.

While I was composing the post earlier, I was thinking that it didn't seem right that a black wire would be the power supply. I'm pretty sure the green wire is the power supply.

NO NO NO....Go back to school to learn how to read schematics.
.
You are dealing with a DC ground circuit. In the diagram. The black, green, orange, blue(lap bar switches interconnect), white wire are all DC- grounded in the safety system. Some are hard grounded and others are switched grounded. The whole purpose of this circuity is ground the safety relay, the starter solenoid, and the magneto (ignition coil) depending which switches are activated. The white wire is your magneto kill circuit. Now whoever drew the diagram does have the contacts of the lap bars switches closed when they are actually open in Park/Neutral position (outboard position). Also the relay contacts is also shown as if the lap bars are not in the park position and the relay is operating.

Now there is also one blue wire off the PTO switch that goes the PTO clutch that is a switched 12v+ circuit. Also the Purple wires are switched 12V+ off the "A1" of the ignition switch. One path is to the PTO switch for the PTO clutch and branches off to the Hour meter. Another Purple branch goes to the engine fuel solenoid and the safety relay. Again 12v+ switched circuit. These purple are hot 12v+ whenever the ignition switch is on or in the start position. Now the yellow wire is the switched starter solenoid trigger wire.

Now that safety relay can be a little hard to find if you don't know what you are looking for as it is taped or zip tied to the wiring harness or otherwise mounted.
View attachment 70165
View attachment 70166
This relay is not listed in the parts list but here is a list of part numbers for it.
View attachment 70167

ST, are you suspecting that the safety relay might be causing the problem?

 

[StarTech]

Not really as I would suspect either lap bar switch or seat switch being more likely but even a pinched wire can cause problems. This you a ohms or continuity meter to test with.

 

[StarTech]

Your of instructional videos.

how to test continuity with a multimeter at DuckDuckGo

DuckDuckGo. Privacy, Simplified.

duckduckgo.com

 

[Loose_Screws]

Thanks for all your help, ST. It's cold with quite a bit of snow here in West Virginia. I'll try to work on the mower next week when it warms up a little and the snow is gone. I don't need to mow, I need to use the mower as a tractor now.