03 7.3 loses all electrical power

[trickyricky23r]

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]

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.

 

[trickyricky23r]

thank you, i'll try that tomorrow

 

[bcvickers]

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]

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]

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.

 

[trickyricky23r]

thank for the help and suggestions. it ended up being a breaking/broken wiring harness on the right side fenderwell. i've driven it a couple weeks with no problems