I'm not sure I would completely discount the switch. That's not to say the issue isn't somewhere else, but the switch is simply closing a set of contacts and is prone to failure. Every time the contacts open or close, you can get arching which will tend to burn the contacts. Eventually, this will increase the resistance of the switch and it will likely have a brownout or intermittent phase before it goes completely bad.
Unfortunately this isn't something you can check with an ohm meter, but you should be able to check for a voltage drop directly across the switch (or any of the wires in the circuit) when the switch is depressed. With my digital meter, I get about .33 volts across the switch when the starter is running. It takes about one second to get a good reading with the settling time of the meter.
Unfortunately this isn't something you can check with an ohm meter, but you should be able to check for a voltage drop directly across the switch (or any of the wires in the circuit) when the switch is depressed. With my digital meter, I get about .33 volts across the switch when the starter is running. It takes about one second to get a good reading with the settling time of the meter.
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