You were correct in wiring the Halos into the parking lights. The fuse will not be blown if both the parking lights work and the halos work(even intermittently). Neither would work at all of the fuse was blown.
It's likely your wiring connection, either where the wires for the Halos connect to the parking lights or where the wiring goes into the halo bulb. I know that you said you soldered them together, but just double check by tugging on the soldering connections to make sure they don't pull apart. From there, check the wiring going from the spliced/soldered connection to the bulb. You can even pull the bulb out and swap them side to side to see if it is the bulb. If you do swap them side to side and the halo failure changes sides you know that it is the bulb that needs replaced.
If it is the bulb, give our Parts Experts a call and they can get you a replacement bulb ASAP!
I hope this helps!
Please let me know if you have any questions in the future!
Dan Bailer | AmericanMuscle.com
Toll Free: 866.727.1266 | M-F 9AM-9PM EST | Sat 9AM-5:30PM EST
Bama Hotline: 888.226.9764 | M-F 9AM-5:30PM EST | Sat 9AM-5:30PM EST
Free Same-Day Shipping!