Dead again
 

Ok so i posted a week or 2 ago about my 05 f250 6.0l which the battery keeps dying and its still doing it, went out this mornin it started then i looked and my battery lite was on i tried putn it n 4hi and it didnt even have enough power to do that and we got about 10 inchs of snow last nite and today and i couldnt even drive my truck so anyhow i let it run for bout 10 minutes then it died so i got a ride to work then when i got home i put the charger on it and it charged for a few hours so i went out and started it again and let it thaw out for bout 10-15min and then it was dead again. Ive had the batts tested and they tested good my alternator is only bout 3wks old but i had it tested anyhow and it tested goid aswell im just getn really frustrated not bn able to drive my truck and idk what to do next, if u need anymore info to help me figure this out just let me know cuz i really need to get this takn care of fast.

The next time you start it put a volt meter on the terminal right on the alternator with pos lead and put ground lead to the engine to see what the voltage is, then put it on baterry terminals, if they are different/bat lower/ then you have a bd ground or the pos wire right off the alternator is bad. Don't be afraid to add another heavy wire from alt to pos battery,

sounds like a bad ground

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check your terminals and clean them and make sure they are making good contact

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also remember any battery testing below 9.6v is a dead battery. if your battery tests below either replace it or if you got the time and patience trickle charge it for minimum 2 days. i have revived batteries well below 9.6v after trickle charging them. good luck

X2. I think i would also check for some parasites

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Ok so when ur saying a bad ground are you talking bout the negatives on the batteries or are you saying the ground on the alternator? Also what is the ground on the alternator bcuz all i have on mine is a plug with 2 small wires and one larger wire, idk much bout electrical stuff so sorry if i sound stupid i usually teach myself everything i know so any detailed directions would be appreciated thx.

Well hust got word from ford dealer it was my wiring harness im guessn that wont b a cheap fix but atleast it will b fixed and hopfully stay runnin for awhile.