The alternator wiring does not right Visit the ECU, but relatively for the fuse box in which it powers everything else in the vehicle such as the ECU. The alternator must keep above 12.6 volts when managing to maintain the charge on the battery. In case you rev the engine https://toyota4age96933.mdkblog.com/38337267/the-best-side-of-4age-engine-for-sale