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I have a 2004 Chevy Silverado 2500 HD with the 6 L motor.

Customer Question
When I turn the ignition...
I have a 2004 Chevy Silverado 2500 HD with the 6 L motor. When I turn the ignition on I'm only getting 2 1/2 V to the ignition e fuse. Also the cluster is not booting up until I start the vehicle and then it's like the alternator takes over and the cluster will boot up. I never did measure the voltage at the ignition e fuse with the engine running. I change the ignition switch and it did not fix the problem. Where should I look now to fix this problem ?
Submitted: 2 years ago.Category: Chevy
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Customer reply replied 2 years ago
One more thing the power windows do not work with the key on and the engine off but if you start the vehicle then the power windows work.
Answered in 46 minutes by:
1/21/2016
Chevy Mechanic: Randall C, ASE Master Tech replied 2 years ago
Randall C
Randall C, ASE Master Tech
Category: Chevy
Satisfied Customers: 13,331
Experience: ASE Master, L1, 32 years, Diagnostic / Electrical Specialist
Verified

Hello, sorry for the delay, I am having to pull many diagrams and back trace them to see what I can offer to help, Bear with me, doing this as fast as I can, Thanks

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Customer reply replied 2 years ago
Ok.
Chevy Mechanic: Randall C, ASE Master Tech replied 2 years ago

ok, in the same under hood fuse box, can you remove the B/U LP fuse a 20 amp fuse, turn key ON, probe the fuse terminals, I need actual volt readings

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Customer reply replied 2 years ago
Ok. I will do that tomorrow when the truck gets back. I will let you know.
Chevy Mechanic: Randall C, ASE Master Tech replied 2 years ago

ok

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Customer reply replied 2 years ago
Just a little update on this truck. Now all of a sudden the heater blower motor stopped working along with the interior lights. Are they connected somehow ? He says everything else works.
Chevy Mechanic: Randall C, ASE Master Tech replied 2 years ago

I cant answer that yet, I asked for a test to be done and was awaiting the reply on my question

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Customer reply replied 2 years ago
Ok sorry.
Customer reply replied 2 years ago
I will have the truck tomorrow at 11 am MT So, I'll be texting you then. Thanks.
Customer reply replied 2 years ago
Ok. Maybe my multi meter was not connecting properly. So same problem but I have battery voltage on those 2 fuses.
Customer reply replied 2 years ago
Could this be a bcm problem ?
Customer reply replied 2 years ago
Ok so let me recap. When I turn the ignition to the run position I have no power to the power windows, no cluster, no abs light, no airbag light. Then I start the truck and all this stuff powers up.
Chevy Mechanic: Randall C, ASE Master Tech replied 2 years ago

Sry for the delay, If still need help, I will have to re read this in the am and start from there. LMK thanks

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Customer reply replied 2 years ago
I'll wait. I'm thinking I need to start at the ignition switch right ? I have replaced the switch so I know it's not that.
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