My 2007 6.7 has 145,00 miles. 4 days ago, the Electronic Throttle Control (ETC) light came on and it hesitated starting. Yesterday, light still on, batteries show great power, and it just makes a strange sound when you turn the key but doesn't turn over. Weird side effect of trying to start - the factory CD player cycles through all of the discs after you quit the start mode.
12.2 V ea., cleaned connections, still won't start.
Thank you all. I'll continue to chase connections while the batteries each charge individually. Unfortunately can't check specific gravity or load test here.
Rt. side positive had corrosion, mostly on auxiliary cable marked "A." Haven't traced where that goes yet.
Had significant draw when I reconnected the first battery. Key off, underhood light only possible thing on. Radio off, but still cycled through the cd exchanger when battery reconnected. Strange. Will disconnect underhood light when I reconnect things.
Underhood light isn't your significant draw. My experience, the ECM draws a bunch of power at hookup time. It is temporary.
More than likely you have one bad battery. Charge them individually, and then check them individually. If you have one bad battery, its lower voltage will drain down the other good battery overnight, and then you have one drained battery and one bad battery = no start. Solution is to replace both if they are stock. If they are relatively new, you can get away with replacing only the bad one.
Thanks to all who replied. Since there hadn't been any slow starting or signs of poor battery power, that wasn't my first suspicion. Each had 12.2 V.
After cleaning every connection imaginable, when it still wouldn't start, I took out the batteries and had them load tested. The second cycle of the test pulled one down to 9 volts. I replaced them and it starts fine.
FYI - The only symptom the truck showed was an intermittent dash display of the Electronic Throttle Control icon. I checked my wife's old receipts, and the only symptom it showed the last time they were replaced was the same thing.
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