Please help, I have a gmc k25000 6.5td. I was driving to work tonite and out of nowhere and very suddenly lost all electrical power to everything from brake lights to the fuel pump. I looked and could not find a relay box, what could it be? please help.

 

Sounds like a fusible link went, and I bet it's the one on the starter. Be 2 wires, and they're on the same lug the battery cable bolts to.

 

thanks wild bill, i really appreciate it.

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I tried to by pass the link and didnt get anything, could it be anything else?

 

check the chassis ground

 

Checked the ground all good there, but i did come up with a weird thing. At the starter solenoid is getting 2.2volts? And that's with it in its dead state parked at the fast food joint i pulled it into. Batteries are at 12.77V.I just got this truck last week too

 

what are you gettin for volts when its running

 

I dont know, . I cant get her going yet.

 

turned out to be a blown link, problem fixed. thanks guys.