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Test electrical system in segments along the way. I assume the Rennbay kit is similar to IceShark's with taking power from alternator and using relays triggered by the stock headlight wiring?
1. Check fuses
2. Test for power from stock headlight wires that trigger relay for low-beams
3. Test for power at relay-end of cable from alternator
4. Test for power at relay-outlet after being triggered ON by factory low-beam wire (step 2)
5. Test for power at low-beam bulb connector
If you have power at the bulb connector, but the bulb's not lighting, then all wiring is Ok, bad bulb.
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