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Will try that, if it is the PPD can they be bypassed or are they necessary?

I have 27 volts going to the top terminal of the polarity protection device and have 9 volts coming out and going to cab, tested the x terminal on dash for 24 volts and only have 9 volts. Tested the 12 volts side and I have 14 volts going to and coming out of PPD. Tested the 12 volt terminal and...

On the polarity protection device on the top side i have 27 volts coming in from the batteries but only 9 volts coming out of the other side. On the bottom I have 14 volts coming in and 14 volts coming out. Would this suggest that the polarity protection device is bad? I also have the 14 volts...