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Amedee
Amedee, GMC Technician
Category: GMC
Satisfied Customers: 26055
Experience:  ASE Technician advanced level specialist
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2007 Yukon Denali 6.2 liter V8. Accidentally connected

Customer Question

2007 Yukon Denali 6.2 liter V8. Accidentally connected battery backwards, now nothing works. No interior lights, no start, nothing. What can I do?
Submitted: 8 months ago.
Category: GMC
Expert:  Amedee replied 8 months ago.

Hello and welcome!

My name isCustomerand I can assist you with your question.

Expert:  Amedee replied 8 months ago.

This problem is caused by a bad connection or blown fuse or fuses.

You would need to start by checking the battery itself, connections and the main or maxi fuses.

It is possible that more than one fuse has blown. You will need to check all fuses inside the vehicle as well as under the hood. I would be willing to bet you have at least a few (if not more) blown fuses.

If you give me a bit, I will locate the main fuses for you.

Expert:  Amedee replied 8 months ago.

Depending on your set up, you will either have one or two MEGA fuses. 175 amp and or a 125 amp fuse located off of the red wire from the battery positive wire. Then the power goes to several other main fuses (60 amp, 50 and 40 amp fuses) in the underhood fuse block that power up several major components on the vehicle.

Expert:  Amedee replied 8 months ago.

I suspect one or more of these fuses have blown due to the battery being hooked up backwards. So be sure not only to check these fuses, but also the rest of them in the underhood fuse block and inside the vehicle as replace them as needed.

Expert:  Amedee replied 8 months ago.

Here is a wiring diagram of the power distribution on your vehicle.

Expert:  Amedee replied 8 months ago.

I am glad I can help!

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Please let me know if you have any further questions.

Regards

Customer: replied 8 months ago.
OK. I will follow your advice. Thank you.
Expert:  Amedee replied 8 months ago.

Your welcome!

Have a great day and please dont forget to rate.

Expert:  Amedee replied 8 months ago.

You should see the rating system towards the top of the page.

Expert:  Amedee replied 8 months ago.

Did you have any further questions sir?

Expert:  Amedee replied 8 months ago.

Or may I call you Derrick?

Expert:  Amedee replied 8 months ago.

Hello! It'sCustomerfrom just answer.

I am just checking in to see if you need any further assistance?

Let me know!