The other day I went to start my 03 F350 7.3L powerstroke and as i turned the key the usual start up went on and as i tried to crank it all power was gone like my batteries were no longer hooked up. I brought in my batteries and alternator to get checked one battery was bad so i bought a new one alternator was good. Went back hooked everything back up and still nothing not one sign of life in my truck. Cleaned all grounds, checked all fuses, and looked for anything out of place. everything is good besides my truck not wanting to come alive. This is my manhood what i use to make my living any help would be awesome. Thanks!
IdahoStrokin
Okay get a volt/ohm meter.
Verify that both batteries have the same voltage ( if you only replaced one thats a big no no, must be done in pairs)
Check Ohm between the ground posts and the engine block
Check ohm from the 4awg wire that runs from the passenger side battery to I forget where.... I'm betting this wire is your problem. IIRC it's the wire that eventually powers your main fusebox
Verify that both batteries have the same voltage ( if you only replaced one thats a big no no, must be done in pairs)
Check Ohm between the ground posts and the engine block
Check ohm from the 4awg wire that runs from the passenger side battery to I forget where.... I'm betting this wire is your problem. IIRC it's the wire that eventually powers your main fusebox
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