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-   -   2008 duramax loses all electrical when trying to start (https://www.duramaxdiesels.com/forum/showthread.php?t=79617)

motobean95 05-15-2018 03:49 PM

2008 duramax loses all electrical when trying to start
 
Hi everyone. I have an 08 duramax. Sometimes when I go to start it I turn key and ALL power shuts down lights gauges everything. Then I cuss and get angry and a few minutes later they all come back on and the truck starts just fine. Not throwing a code at all. Batteries are brand new . any suggestions?
Thanks in advance

juddski88 05-15-2018 05:28 PM

Loose battery cable?

Burn Down 05-15-2018 06:10 PM

I was just messing with this on the 05', the exact same issue. Near as I can tell it was a loose connector at the at the tcm. This truck also had a BD Tap Shifter installed so I made sure these were clicked in place as well. Seems fine now and I can't move the harness around and make the power come and go.

2004LB7 05-15-2018 06:19 PM

Always check your battery connection first

motobean95 05-15-2018 07:35 PM

Battery cables are clean and tight I thought maybe a loose harness too but it kind of resets itself after a min or so. Almost like a relay but I lose all power not just one thing or another

TheBac 05-15-2018 07:46 PM

You should probably pull the cover off the underhood fuse box and check for evidence of rodent damage. I'd also check the main power lead integrity where it attaches in the box.

1FastBrick 05-15-2018 09:45 PM

Didn't the 07 and 08 have under hood fuse box connection issues in some cases causing an intermittent loss of power?

motobean95 05-15-2018 10:19 PM

Quote:

Originally Posted by 1FastBrick (Post 1103034)
Didn't the 07 and 08 have under hood fuse box connection issues in some cases causing an intermittent loss of power?

Anything more abut this????

It's weird cause a min or two later it comes right back to life on its own

1FastBrick 05-15-2018 10:29 PM

I remember a few people having issues that were tracked back to the connection under the fuse box.

See this thread. http://www.gminsidenews.com/forums/f...htmare-106736/

Ron Nielson 05-16-2018 12:52 PM

When the problem occurs, start shaking the battery wires, wires to the fuse box, wire to the starter. Something will show up. Try connecting a jumper cable from the battery neg to the engine block, or to the firewall. No question there is a circuit problem. Corrosion can be a real problem. Just a 5 ohm load can kill a circuit and corrosion can be a 5 ohm problem easily. Any green powered stuff around or under the fuse box? Look for broken or chewed wires.

motobean95 05-17-2018 09:45 AM

Quote:

Originally Posted by Ron Nielson (Post 1103095)
When the problem occurs, start shaking the battery wires, wires to the fuse box, wire to the starter. Something will show up. Try connecting a jumper cable from the battery neg to the engine block, or to the firewall. No question there is a circuit problem. Corrosion can be a real problem. Just a 5 ohm load can kill a circuit and corrosion can be a 5 ohm problem easily. Any green powered stuff around or under the fuse box? Look for broken or chewed wires.

I don't see an corrosion. and I've tried playing with all the wires but like I said it comes back to life by its self in a min or two. I've tried to MAKE it do it but it just randomly does it when starting the truck . is there any relay that would kill EVERYTHING and then resets? I know there are many relays for this or that but I lose ALL power. No door locks or dome lights nothing.

2004LB7 05-17-2018 09:59 AM

I'd look closely at the mega fuse(s) and related wiring

1FastBrick 05-17-2018 10:30 PM

Another Option could be the electrical part of the Ignition Starter Switch. I did one recently and their cheap and easy to do.

Vehicle would be dead. Left owner stranded in parking lot a few times. also stated it died at in intersection but restarted. Had it towed home 2 times. Always worked for me and could never get it to duplicate issue. After replacing the electrical part of the switch, The issue has not returned. I expected to find badly burnt or damaged contacts in side and that was not the case. At least it was fairly inexpensive part.

JoshH 05-18-2018 07:34 AM

Double check all your grounds too.

motobean95 05-18-2018 09:09 AM

Quote:

Originally Posted by 2004LB7 (Post 1103187)
I'd look closely at the mega fuse(s) and related wiring

Would the mega fuse reset itself after a min or two?


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