Thread: It won't even crank :(

Loose connection somewhere is my guess.

I also have been experiencing issues with the electrical system in a '02 GP. I have not had the cranking issue like JohnJ89 has. The cause may be totally different. But, after doing plenty of searching of electrical problems on the 3800, a lot of problems can be caused from bad connection to the battery.
In my GP, the engine is slow to start up, even though it is tuned up, starter is working ok, and the battery is brand new. After the engine starts, the idle will sometimes be rough. And the dash lights and DIC and interior lights will glow bright, then get dim.
The battery side post cable bolts that hook up to the battery are the original ones. The negative terminal bolt has been stripped out for some time. I can turn it with my fingers.
Others that have had no startup or slow starting, and rough idle, and dimming lights have pointed to the fact that there must be a secure fit of the battery cables to the battery in these cars. So, even though the side bolts are twisted into the battery, they are not making enough of a connection for electrical current to flow.
So, I am going to try replacing the bolts to see if that makes a difference.