I have an old GMC Safari van that has a HU that isn't working properly. When you listen to a station you can barely hear anything. I have a unit from my wifes Elantra that I was thinking about putting in there but the plugs are different....obviously. Is there an adapter that can fit both ends (van plug and HU) or is it something I am going have to splice together (once i find the correct plug). Thanks.

 

you'll probably need to buy a GMC harness, and a hyundai
"reverse harness", and splice them together, which will be
easy because you can usually just color-match the wires.
I've bought harnesses from http://www.audiooutfitter.com
before, fwiw.