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Originally Posted by Green Monster
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This is an update for anyone considering this $25 headlight harness from Amazon with relays designed to improve lighting.
I installed it yesterday afternoon and it was plug and play- no cutting, no crimping and no soldering. The universal harness with relays was exactly the right length as if it was designed specifically for a 72 Blazer. The ceramic female connectors for plugging into the headlights was a nice surprise upgrade over my expectation of original plastic style connectors. This will help prevent the harness from deforming due to heat. The wire harness was easy to hide allowing me to maintain a stock engine bay appearance. The H4 conversion headlights stay nice and bright, even at idle.
A drastic improvement over the Sylvania Silverstar that I had to keep replacing frequently. The $92 spent on this harness and Hella H4 conversation was worth every penny.