GregNettles

iTrader: (1)

Just did a 6.0 swap in the place of my 4.8. For the most part it was easy and straight forward. The engine was a 05 model so I swapped my harness over to the engine and used my stock 4.8 computer and from what I've been told it should start right up.... It doesn't. It gets no fire to the starter. It won't make a sound. Now that being said the computer was disconnected for a week and so was the battery. Could it be the pass lock or vats or what??? The only connectors not connected is the oil sensor that was on my passenger side of the 4.8 oil pan as the 6.0 doesn't have the sensor and the egr plug as I put headers and block off plates then there is a small plug on the harness that leads to the A/C drier and down to the O2 sensors that isn't plugged to anything and I have no idea what it goes to. It's not very long just right on the passenger side. But I don't think that one plug would stop the thing from spinning over. I would understand it spinning and not firing but it won't even spin over!!! Please help. Thanks.

FFDP

iTrader: (2)

So the dash lights all come on right?

The fuel pump primes??

I think you have a minor wiring problem to the starter if you turn the key over and you don't even get a click or anything. Something isnt grounded.

AKlowriderZ71

iTrader: (22)

Are you getting power to the small wire connector on the starter solenoid when turning the key? Is the small wire connected to the wrong post on the solenoid?

GregNettles

iTrader: (1)

No power to the small wire at the starter. At all. That's why I ask could it be the security system or something

AKlowriderZ71

iTrader: (22)

Security system would kill the fuel pump. Nothing to do with the starter.

You could swap out the starter relay with another matching relay under the hood. Recheck for loose connections in the battery cables & grounds. Double check to make sure you didn't over torque the nuts & crack the starter solenoid.

Did you have the transmission out? If so, check the park/neutral safety switch & harness as well.

GregNettles

iTrader: (1)

I did have to unplug the trans as I swapped my stick harness onto the 6.0. I had to pull the black piece that goes on side of the trans off my stock one and swap it to the one i got with the 6.0 because the plug was different. It's the piece that the stud the shift cable attatches to passes thru.

1FastBrick

iTrader: (17)

Check your connection's at the fuse box and the PCM. Make sure they are bolted down and connected properly.

gagliano7

Does the truck think it is in gear.? See if it will start in neutral.

GMC93

The grounds on the drivers side bottom of the block and the ones behind the drivers side head on and tight?

LS1TRUCKGUY

iTrader: (7)

Does the PRND321 indicator read when switching between the gears?