Duramax Diesels Forum Truck of the Week
Old 03-28-2018, 08:22 AM
jake23 jake23 is offline
Join Date: Mar 2018
Posts: 9
Exclamation Head Gasket Job (truck wont crank now)

Hi everyone,

New to the forum. Figured you all knew your stuff so i thought I would ask this question here.

Just did my first head gasket job on an 01 lb7 that is completely stock. Just put everything back together and hooked the batteries up and immediately the hazards lights starting flashing, little red alarm is going off in the truck, and its dinging and lights are flashing on the dash. It will not even let me turn it over

So anyone have any recommendations. Im assuming its something wrong with the wiring.

Thanks in advance guys. All help is greatly appreciated.

01 LB7 stock
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Old 03-28-2018, 09:42 AM
DAVe3283's Avatar
DAVe3283 DAVe3283 is offline
Heavy & Slow

Join Date: Sep 2009
Location: Boise, ID, USA
Posts: 2,919


Ensure you reconnected all the grounds (including the big ground strap on the back of the driver's side head). Just double-check any wires you touched.

Worst case you can start pulling fuses and see if/when things start behaving. But I suspect you missed a ground somewhere, or have a loose positive wire (glow plug or intake air heater?) shorting to something and powering things up that shouldn't be.

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Old 03-28-2018, 10:52 AM
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Sledhead Sledhead is offline
Mountain Pass Machine
Join Date: Nov 2008
Location: BC
Posts: 881


Aftermarket alarm?

03 CC DRW 4X4 EFI Live, EPR Twins GMax-5
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Old 03-28-2018, 12:18 PM
jake23 jake23 is offline
Join Date: Mar 2018
Posts: 9

Thanks DAVe3283 for the suggestions. I will check on all that tonight.
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Old 03-28-2018, 12:19 PM
jake23 jake23 is offline
Join Date: Mar 2018
Posts: 9

Sledhead, No
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Old 03-28-2018, 08:37 PM
jake23 jake23 is offline
Join Date: Mar 2018
Posts: 9

Started pulling fuses tonight and when I pull IGN A (it's one of the big 40s) all my flashing lights, alarm, dash light problems go away. As soon as I plug it back in it does the same thing. What does this mean?
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Old 03-28-2018, 08:56 PM
Chevy1925's Avatar
Chevy1925 Chevy1925 is offline
don't know sh!t about IFS

Join Date: Oct 2009
Location: Phoenix Az
Posts: 14,835


It means you stopped power to all the flashing lights, alarms and dash lights.
Originally Posted by JoshH View Post
Mike L is my role model. I want to be like him when I grow up.

02 LB7, LLY, LBZ, LMM, LML, L5P 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
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