Hi, There are probably a dozen ways to do this. Some Googling indicated that I could add a 1K uf capacitor in parallel to a 10K fixed resistor AFTER a SPST switch:

1) Does this sound correct?

1a) On a 12v circuit, does it matter if I I use a 35v 1K uf capacitor... Radio Shack has 35v:
- https://www.radioshack.com/products/radioshack-1000uf-35v-20-radial-lead-electrolytic-capacitor
- https://www.radioshack.com/products/radioshack-1000uf-35v-20-axial-lead-electrolytic-capacitor

1b) Which of these 10K resistors should/could I use?
https://www.radioshack.com/pages/search-results?search={q=10K%20resistor}

2) Any other simple/inexpensive routes?

The application is that I want to add a mercury tilt switch to my pickup's tailgate to activate the timed OEM LED pickup truck cargo lights are activated by an OEM manual momentary push button switch.

I purchased a mercury tilt switch to put in the tailgate, I just need to change it to send a momentary signal (like the OEM momentary switch does) to activate the LED lights.

Thanks,
Jim

 

I'm thinking more like 22 uf, and the 10k resistor is not in parallel, it's to ground, after the capacitor. Any capacitor rated for 25 volts or higher should work. The resistor should be at least 1/20th of a watt, so you probably can't buy one too small. 1/4W 1/2 watt No problem.