Is there a good way to test an RCA cable to make sure it is good with a DMM? I was having a problem with my system where I would turn it up and it would start cutting out at the higher volumes. My Alpine amp requires Y splitter RCA's and I was able to test things out and found that it's the RCA from the HU to the splitters and more specifically, the black side of the cable. It's the mid line KnuKonceptz RCA. I wanted to test it, if possible as well as test the Y splitters as well.

 

Sure, it's simple to test. No DMM needed. Simply swap left to right RCA connections one by one in an organized fashion. You can isolate the problem that way. Otherwise, you can substitute a cheap RCA cable one at a time and run it outside the car. Any cheap charlie RCA from Radio Shack will do.

Also, take a look at this troubleshooting chart. It is really set up for a home system with separate inputs (phono, tape, CD,tuner, etc) a preamp, power amp, and speakers. The concept is exactly the same, though. It's just that some of the possibilities like a bad phono cartridge are invalid. It doesn't matter.
http://www.avahifi.com/root/ordering_info/..._flow_chart.htm

 

if you use a DMM set it to resitance or OHMs - if you get zero you have a bad connection , if you read 1-4 ohms your good , anything less or more you've got a bad cable or pinch in the line.