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Discussion Starter · #1 ·
1 year old batteries starter alternator GP relay, was running great then tonight something happened.
will not crank, GP relay and something else clicks repeatedly and the batteries act like they are dead. Starter does the fast click like its dead. Hooked up a charger 55amp 150 amp starting and volt gauge shows @16 volts still the fast click, and the charger shows a spike in charging when the GP relay clicks. 2 amp charge for 30 min and it acts like the batteries are dead, tried jumping the starter relay and single click on the starter. Cab lights are dim and the "dinger" sounds like a dead battery but only a moment on 20 amp charge and everything is normal on the inside of the cab. still will not crank.
First time i tried using the charger 150amp starting boost it started up and seemed to run fine shut it off and now its the above.
 

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Your batteries are dead or have bad or shorted cells.
 

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Discussion Starter · #3 ·
Just pulled both will have them load tested.one is a six-month-old Motorcraft battery 1000 cold cranking amp the other is just over a year old so hopefully if they are bad they're just warranty crazy they would go bad that quickly
 
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