Wiper motor still keeps going

[Almightys]

So yesterday coming back to port and taking on some spray. I was using the wipers and noticed not the port and starboard units just kept going when I switched off. They both over heated to the point the starboard unit smoldered a bit and I quickly removed cover to remove one of the power wires. That shit the unit off and the port just magically turned itself off. I was moving the switches on off to try to get to stop with no luck. so this morning I am looking at them and turn the switch on each. Both work and turn off????
What do you think gives? Am
I leaving them on too long? Just looking for advice here. Boat is a 95 500 DA

 

[Express 390]

So yesterday coming back to port and taking on some spray. I was using the wipers and noticed not the port and starboard units just kept going when I switched off. They both over heated to the point the starboard unit smoldered a bit and I quickly removed cover to remove one of the power wires. That shit the unit off and the port just magically turned itself off. I was moving the switches on off to try to get to stop with no luck. so this morning I am looking at them and turn the switch on each. Both work and turn off????
What do you think gives? Am
I leaving them on too long? Just looking for advice here. Boat is a 95 500 DA

Was the spray kicking up getting the dash wet?

 

[Almightys]

Was the spray kicking up getting the dash wet?

Not in that area

 

[Express 390]

Not in that area

Aside From Possibly having a faulty switch, You Got me!

 

[Creekwood]

If they are the standard Carling switches, they likely got salt water on them at some time and are sticking on. Cheap to buy and an easy fix to replace them.