Intermitten starting issue

[ffellisbat9]

I have been having an intermittent issue with my truck starting. I have a CC/SB 08 GMC. I bought it used, recent purchase, and it has a few different mods that I'm aware of. The batteries appear to be the factory originals.

So far, in the 3 weeks I've owned the vehicle, it has randomly died after being shut off. The first time I drove it to work no issue and parked outside. I then moved it inside after a few hours to clean it out. I left it parked inside about 3-4 hours and it died. No I didn't leave anything on, it just died. I didn't think anything of it, jumped it and went on my way. I haven't had an issue for about 2 weeks. Today I drove to work again and parked outside. When I went to go run an errand 2 hours after parking it, the dam thing was dead again.

I don't think it's the batteries, and here is why. Sometimes when I turn the key everything boots up including the radio, it just won't turn over. Other times when I turn the key it acts like it has no juice. There isn't consistency. If it were the batteries would it really go almost 2 weeks before there being an issue again?

I appreciate any assistance with this.

 

[elliottw]

Bad batteries can cause odd issues. I'd get them load tested and go from there

 

[jacobdewey]

Do you have an aftermarket stereo in it?

 

[Yellow Jacket]

If they are original batteries, I would replace them, I've had a few LMM's with similar issues. Check connections at passenger side maxifuse/junction on firewall near battery.

 

[ffellisbat9]

There is no aftermarket stereo at all.

I am going to have them load tested after work tonight and I will see what they say. I just thought it weird for the batteries to be fine to get to work and then two hours later dead after two weeks of being fine.

I'm all new to the diesel gods though, first diesel ever!

 

[elliottw]

How about an aftermarket auto start? I've removed many that caused odd electrical issues. And since this is your first diesel, you may or may not know already, but if one of your batteries is bad replace both of them.

 

[ffellisbat9]

How about an aftermarket auto start? I've removed many that caused odd electrical issues. And since this is your first diesel, you may or may not know already, but if one of your batteries is bad replace both of them.

Stock remote start. I figured it was probably best to replace both, now I know for sure. Thanks.

 

[ffellisbat9]

Well apparently both batteries were no good according to Autozone and Batteries Plus. $277 later al appears to be good again.