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Hello everyone.
After about 10/15 minutes I have the car running my fuel pressure drops almost seems like the car surging for power so I checked everything with the multimeter and this is what I found. Car off batt 12.72, start car batt 11.96 and at alt 0.06?
am I missing something here? Does alt need its own ground? 2008 5.4 gt500 alt so i believe its a 6g
Thank you
 

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Is the motor grounded?

The alternator itself shouldn't need it's own ground as it's already grounded thru its mounts....

Sent from my SM-N960U using Tapatalk
 

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Official OLD GUY
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Pull it and have it tested - sounds like you have a bad diode array internally . . . gotta get all those electrons moving in the right direction.

Doc
 
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