Refund Refresh 4-Day SaleEnds Monday. Limited quantities. No rainchecks.Shop now

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Refund Refresh 4-Day SaleEnds Monday. Limited quantities. No rainchecks.Shop now

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car speaker harnesses

Speed Harness

A speed harness is a cable that connects the battery to the alternator. It is used in conjunction with a battery cable and a power distribution center. Browse the top-ranked list of speed harnesses below along with associated reviews and opinions. 

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In-store pricing may vary. Prices and offers are subject to change. © 2026 Best Buy. All rights reserved. BEST BUY, the BEST BUY logo, the tag design, and MY BEST BUY are trademarks of Best Buy and its affiliated companies.