Electrical problem

[Reecehigh]

I have a 2008 Yukon Denali with 180000 miles and recently started having electrical problems. I'm driving and the radio cuts in and out and the door locks cycle a few times. Then everything comes back. As soon as I park and kill the engine the entire power system shuts down. It's happening more and more and I'm close to getting rid of it.

 

[swathdiver]

Welcome to the forum Reginald. Sounds like you have a bad cell in your battery and or a ground wire connection problem. How old is your battery?

 

[intheburbs]

Locks cycling three times is a voltage drop. First thing I'd check are your battery cables and grounds. Then, have the alternator and battery tested free at an auto parts store.

 

[kbuskill]

Very common issue... most likely culprit is the battery cables. But as others have mentioned... have battery load tested.