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p1389 after head job????

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Old Jan 27, 2015 | 10:35 PM
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Originally Posted by joshmerriam86
One wire goes to the PCM the other to the evap thing under the battery. After doing some research I found that this is a problem with the new PCM's with the built in voltage regulators. My best guess the voltage regulator was letting to much by and causing a short. I found a site to convert back to external regulator and bypass the PCM to still charge the battery without cooking everything
The external Regulator Mod will not allow you to pass inspection in many states due to how the cluster is controlled; it will register the 0562 and may or may not render your voltage gauge inoperable.
 
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