Quote:
Originally Posted by 1971Stepside
If one springs for the Holley retro headlights do those need this relay option?
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No relay required when running any LED headlight. I've tested this on my two Suburbans with Holley/Retrobrights and United Pacific. One with relay, one without, no change in LED light brightness or performance.
If running stock headlights or H4 upgrade, relay setup is highly recommended.
It's worth mentioning that the relay setup does take the load off the headlight switch so regardless which headlight you run (stock, H4 or LED), it's an upgrade.