1990 GMC suberban 1500 won't start.

Check your security guard system if it has it probably think! That you're the burglar and shutdown the system.[/Quote:6dfc1f4bd3]

I don't have a security system. I checked the fuses and they are good. But thanks for the information so far.

Check your security guard system if it has it probably think! That you're the burglar and shutdown the system.[/Quote:b91e79bedd]

I don't have a security system. I checked the fuses and they are good. But thanks for the information so far.[/Quote:b91e79bedd]

Read the battery voltage what is it? Double check all connections on the battery. Why did you replace the battery is it because of the present problem or what-talk to me.[/Quote:b91e79bedd]

I replaced the battery because it would not start or take a jump start, when I put in the new battery the truck started and died I started it again and it died, then I checked the fluid levels they were all good, so I started the truck again and gave it some gas to keep it running then I drove it for 1 mile parked it dissconnected the battery the nexted day reconnected the battery and no power to anything it's like there is no battery at all. The battery reads 12V.

Sorry 12.6 Volts I figured 12V was good enought. If I'm not getting any power to lights. Radio, power windows or locks, or to the dashboard how can it be the battery terminal on the starter? I how many fusible linsk are there? Where is the power distribution box located? I found a inline fuse and it was ok.

Thank you for the help so far. I will keep checking.

I treally sounds to me like you have a poor connection of your ground wire to the metal chassis. If this is loose, broken or corroded, you will have a condition where nothing works electrically. Follow the wire from the negative terminal on your battery to where it attaches to the frame of the vehicle. If this connection is loose or corroded, nothing will work.