Seller notes

This boost mod is designed to raise the stock 14.2V cold Toyota voltage set point .8V higher (stage 1/ 14.5-14.8V cold relative to battery state and operating temp) to provide better performance from your stock or high amp alternator that are limited to this voltage. Any Toyota, Lexus, or Scion will accept this boost plug (it will plug in between the factory harness and the alternator) This boost mod is specific to these applications that use the plug code shown in the diagram (IG S L M(fr) It w...

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