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Does a failing alternator affect the IFZ transfer to the HFM?
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Basically the answer is no. The alternator has no bearing on car electrics. Its sole purpose is to charge the battery, unless of course it wasn't charging, and the battery was going flat, then it would have an indirect bearing on car electrics. At the other end of the scale if it was over charging, the over voltage protection relay would either shut down or blow the 10 amp fuse.
Has the engine wiring harness been replaced??.