Quote:
Originally Posted by BR3W CITY
That code pops when the ECM is trying to regulate voltage and gets no result back.
Check for voltage on the dark blue wire, should be over 10v
See if the resistance between terminals is more than 15ohms
Or something in the ECM needs to be changed. Depending on how it was setup, the ecm may be looking to control the voltage, where most of the older truck alternators are internally regulated.
I think Hart Rod had this code and a similar issue on his.
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If your alternator is internally regulated, you can set this DTC to inactive.