They are WAY underrated in current capacity for the application and if the kid drives it pretty much steady "til the batteries go dead, they will overheat and the contacts will squash out of position into the heat-softened plastic.
They MAY test OK with an Ohmmeter, but NOT carry the current needed to run the motors.
You need to check with a Voltmeter across each set of contacts in use on each switch in use for the particular function that doesn"t work UNDER LOAD, in other words with the "gas pedal" depressed to figure out which contacts have the voltage dropped across them.
Better put it on some sort of kickstands sop it doesn"t run away from you if it DOES kick in!.
If there are TWO or more contacts failed, it"s gonna be like a series set of Christmas lights to troubleshoot
In the era of your"s I had to keep two running. I had a box of switches and would troubleshoot by swapping "em out.
As a matter of fact, I would just replace all three switches and verify that it works, then you could swap the old ones back in one at a time and have spares for the ones that ARE working correctly.
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