Based on your description: 24V is connected to the switch. A manufacturer normally doesn't add resistors, just connects power to one end, and a signal wire to the other end. So if there's a resistor, I expect it to be on the other side of the switch.
Also a 3k value is unusual (3.3k is a very common standard value), and considering a switch needs only minimal current it's quite a low value.
The most common arrangement for switches is to connect one end to the ground, and the signal wire to the other end. Makes it easier to read. I'd only expect to see it connected to 24V if you're using a negative ground system (so the positive rail being the 0V circuit reference, and negative rail at -24V), which used to be quite common but which is rare nowadays.