Upgrading your Hummer or Pathfinder to 7" LED headlights? You will need two 9004 to H4 power adapters to do so. 9004 end plugs into the factory headlight harness and the H4 connector plugs into the 7" LED headlight.
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9004 to H4 harness adapter
These are great, doing a conversion and with these I don't have to cut up the stock wiring