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2005 645ci
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Discussion Starter · #22 ·
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no error but it looks like there is a voltage issue… about 5 mins into a 30 minute drive the voltage dropped to zero for a second or less…..since i just replaced the reservoir im not gonna replace the alternator or regulator yet, id like to see if the error returns first
 

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Strange that it would go to zero, but I have seen under voltage faults before. The VR usually puts out excess voltage. The modules are designed to run at very close to 5 volts, anything off of 5 volts throws a fault. Try checking out the voltage at the jump terminal, just to see if you get a different reading?
 
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