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Hello and thank you for your question,If you take your volt meter and check the voltage at the starter do you have at least 12.5 volts?If the battery checks okay take your volt meter and back probe the negative cable and positive cable and see what the voltage reads a few inches back on the cable and let me know the results.
Okay then since everything is dad in the truck we really need to check the voltage coming through the cables. Is there someway you can check this?
Unfortunately I am unable to make a phone call at the moment but will be glad to help you from this post. We need to start with checking the voltage coming out of the battery on the cables, if you had no problem before you installed the new battery it almost has to be a connection concern if you are sure the battery is fully charged.
All power to the truck comes from the battery as you know and if everything is dead then it has to be something to do with the cable and or the connections. Let start with rechecking them to be sure you have power out of the battery through the cables. Let me know and we can work from there.
Your 2008 does not have any reset switches, if you have a good battery and power out of it through the cables you should have power in the complete system. Let me know the results and we can work from there .
If you go inside at the interior fuse panel , are you getting voltage to the fuses with the key on?
Check this for me next and let me know if all the fuses have key on power.
I would agree with that, power to the truck comes from the battery to the fuse panel on the yellow/light green wire from the connector at the battery harness. See the wiring diagram in the link below and have a close look at the connector where the yellow/lite green power wire connects. I think your going to find the problem there. Copy and paste the link to your browser to open and view the link.https://dl.dropboxusercontent.com/u/104923897/Battery%20Nov%2023.pdf
Take a close look at the connector.
Yes right where the positive cable connects you should see the connector C1100, see the location in the link below.https://dl.dropboxusercontent.com/u/104923897/C1100%20Nov%2023.pdf
Either and or both as well as possible corrosion in the connector, anything that may have been disturbed when you replaced the battery the yellow/lite green wire is the power wire that powers the interior fuse panel.
Locate the wire mentioned and check the voltage on it. It should match the battery voltage on both sides of the connector.
Follow the smaller two wire to the connector, you very close.
The yellow/green is the power feed to the interior fuse panel. They both connect to the battery at the connector I showed you.
Yes that is correct and there are only two , the third one is the positive battery cable.
Yes, the wire likely change colors at the connector.
It is caused by the fact the yellow .green wire dose not have any power, they find the source of that and you should be good to go, I don't think its going to be a costly repair as well. Im here if you need me , Please take a moment to rate my service so I can get credit for my time, the question remains open for follow up even after doing so, all you need to do is return to this question if need be.Thank you again.