P063d Code with lightening bolt symbol

[klaybus]

Hey guys,
I got a new code to me. P063d, 07.5 2500 6.7. Has anyone had this code? It shows the lightening bolt associated with the APPS but the code refers to the alternator. I checked all of my battery connections, they're tight. Batteries are new. Is it the alternator putting out too much voltage??
Looking for any info I can get before replacing the alternator unnecessarily.

Thanks,
Clay

 

[sag2]

Make sure the batteries test good. Then remove and clean all battery and generator connections, especially the crossover cable between the batteries. If you have a meter, check the voltage at both batteries before you attempt anything. If they are not the same is high resistance in the connections or the battery(s)

 

[klaybus]

Make sure the batteries test good. Then remove and clean all battery and generator connections, especially the crossover cable between the batteries. If you have a meter, check the voltage at both batteries before you attempt anything. If they are not the same is high resistance in the connections or the battery(s)

Thanks for the reply. I inspected the positive on the passenger side & it was shot! Replaced the cable & all is now well. I just had the ECM, negative crossover cable & battery's but the positive they said d was ok. Wrong!!
Upon replacing the crossover negative all is now good. Cleared the code ' all ia well again!

 

[Scott6]

Both times by lightning bolt was there it was bad batteries and that’s it. I put in some Bosch AGM blue tops I got on sale and they have been a step about and Johnson Control cell (walmart and parts store brands) for only a little more green.