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System voltage drop during start

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rmoehle

New Member
Joined
Aug 13, 2015
Messages
3
Location
San Antonio, TX
Hello elec-xperts,
My engine computer began dropping offline while cranking. I ran some tests, and the system voltage is >12V at power-on, but the bus voltage drops to ~8V while the starter cranks. I feel like this is below the operating voltage of the ECU.
I'm far from an electrical expert - what could be wrong and what could I do to fix it?
Thanks!
Robert
 
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