03 7.3 loses all electrical power

trickyricky23r

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four times now it has lost all battery power while going down the road. the first three times were momentary but was enough that i had to reset the radio. this last time it was in a bad spot on a busy highway and it was dead for about 10 minutes. no power at all, didn't even have hazards. i've asked a few local diesel guys and they are stumped, please help
 

DaveBen

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It sounds like a loose ground connection. Check ALL of your connections to the batteries and the starting solenoid. Check that they are CLEAN and tight.
 

bcvickers

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Did you solve this yet? I can almost guarantee it's the large power connection behind the battery on the drivers side inner fenderwell.
 

trickyricky23r

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no i haven't solved it yet but i did figure out it mostly happens on hard bumps, potholes, etc. i'll check that out tomorrow after work. thank you!
 

rmwitt

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definitely, check your grounding cables: one on each side of the block. Hard to get to, but they will make a difference. Also, consider adding or checking additional grounds per the attached. The attached also includes testing parameters and instructions for a volt meter.
 

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