Craig's directions for a ghetto test light:

1. Get a random bulb that still is attached to socket/wiring.
2. Take black wire on said assembly, ground it to something.
3. Take red wire and put to positive to whatever you want to test.

If the bulb lights up, you have some semblance of voltage. It works in a pinch and is easy to do. Test the wires like that and trace your issue. It sounds to me like you might have either a bad ground or an inconsistant power source. There isn't any real need to rewire the stocker when you're 2mm away from figuring out what the issue is with the new wiring. Just go backwards, trace your connections, trace your grounds and check your work. If all else fails and your shit is solid, get a new relay.