2008 Tahoe Elctrical issues.

[Isaiah Morgan]

I’m new to the forum, and have a few questions about my Tahoe. I have 08 Tahoe 4x4 lt, with 82,000 Miles. I am having some electrical issues.
Yesterday when I started it and started driving and noticed the speedometer wasn’t working or any of the gauges. So I pulled over and shut it off and turned it back on same problem. Then I disconnected the negative battery cable and connected it back, problem solved.
I get back in it this morning the blower motor wouldn’t work, drove a little ways down the road it started working. Then also when I switch my lights from dim to high the radio shuts off. Any one had theses problems? Wondering if someone could point me in right direction.

 

[PG01]

Check all your grounds. Batt to engine, engine to firewall, etc....

 

[Isaiah Morgan]

Check all your grounds. Batt to engine, engine to firewall, etc....

Thanks! I’ll give it a try

 

[tsuintx]

Also make sure your battery is properly charged and the alternator is working properly. They could create all kinds of headaches, too.

 

[Isaiah Morgan]

I had autozone test my battery and alternator about a month ago, they both checked out good. I will have it rechecked to be sure. Does anyone have a good picture diagram of all the ground wires and where there located so I can make sure I check them all?

 

[retiredsparky]

If you do find all the grounds and they are good---even if the battery checks out, a last ditch thing to try is replace the battery. Internal electrical noise from a battery can cause strange symptoms. This is not likely to be your problem, but I have fixed strange symptoms this way.