9004 to H4
This will allow you to install a H4 bulb in place of your 9004 bulb.
9004 socket plugs into your harness, H4 socket plugs into H4 bulb.
Made with 14 gauge SXL wire, terminals are crimped and soldered and loom is installed to protect the wires.
9004 to H4: $25.00 pair. (2 harnesses)