(2007 Sierra Classic) So I have had this Stereo for about 4 months and for those 4 months it worked awesome since I put it in. But recently it stopped working on cold starts but would turn on after I left work maybe 9 hours later. Now it won't turn on going to or from work. I thought it was the cold but yesterday I decided to try and figure it out.

This is what I found. Radio didn't turn on so I unplugged the fuses and plugged them back in turn the truck into "on or ACC" position after a few seconds Radio turned on fine and so did my chimes. So then I turned the truck over as my truck was turning on my dash lights dimmed a bit then my truck turned on but no radio. Sitting in the truck warming it up I thought maybe my phone charger in my cig lighter was draining my battery because of the dimming lights so I took it out. I also know that it will charge my phone whether the truck is on or not so maybe it is draining just enough power to not have enough juice to turn on the radio? After having it idle a bit I did the steps over again with the fuses and bam when I turned my truck on the radio worked. So this morning got into my truck finally going to listen to some music and boom doesn't work anymore. It seems like I have to take out the fuses and put them in every time I want to listen to the radio and let the engine idle for a bit. What could be causing this? Battery shows about 11 when engine is off and a little over 14 when engine is on.

 

I'd toss a different battery in there before doing anything drastic.

My truck's done some weird **** with a low battery.

 

Yeah probably going to do that soon. I think it's still in spec being beetween 10-14. Doesn't help I have a 212/218 111 LSA CAM in there it's tuned but start up aren't confidence inspiring. Some good threads on batteries lately that I have read through probably going duralast

 

That cam should have no problem starting, it's very mild.

 

I thought so too