2004 Pontiac Grand Am no start. Tried to jump start and electrical system seems to short out 1x then its dead. Disconnect and reconnect cables and the same results. Any thoughts?

In the link.

https://www.google.com/search?q=2004+pontiac+grand+prix+starter+wiring+diagram

Sounds like you found the problem . get a new MAP sensor or take the one you have to the dealer to be tested . Good Luck

check battery make sure it is 12.6 volts.have vechicle jump start if it starts battery probably weak if jump start dont work either starter solenoid or starter faulty or vechicle in theft security mode.besure to turn off radio first to keep from locking out radio when you disconnect negative battery cable to check battery and starter at the auto parts store .

Need a little clarification to help. When you say the starter would not engage, do you mean it made no noise and didn't spin? I assume this is what you are talking about. Can be a few items. It may be the neutral safety switch (or clutch switch if manual transmission), wiring or the starter. Probably the starter has a dead spot and needs to be replaced. You can try and tap the side of the starter with a hammer and see if that works (if it does replace the starter) Modern starters come with the solenoid attached. Hope that helps. Can help more with a lttile more info.

Sounds like dead battery and dead alternator/regulator.

Your problem is likely a bad battery and/or corrosion on the battery terminals. Remove the cables from the battery terminals and clean them with a wire brush or other tool. NOTE: always remove the negative cable first and reconnect it last. Reconnect the cables and then try to start/jump the vehicle again. If that doesn't clear the problem, take the battery to your local auto parts store or supplier and have them check it. You will probably need a new one.

I suggest you pull the battery and have it checked. Most chain auto parts stores will do this for free. It can take a while if your battery is dead. Another way is to swap batteries with another car. After you get your car started disconnect the positve ( red) battery cable. If the engine dies your Alterator is bad. If you have a bad Alterator it could have ruined your Battery too. If the engine continues to run it is probably a bad battery.

Sounds like ignition switch problem.

You need to Trace the Negative and Positive Battery cables all the way back to the other ends. Possibly just replace them both Just too be careful. This will short out the Cables very Rapidly.

I had a similiar problem recently. The car would not start and no sign of life no lights etc. I jump started it acouple of times but then even this did not work. It would jump start but right after the cables are disconnected it would stop. We checked the battery it was good. Turned out it was the alternator. It was not working properley so the system was not charging itself or even when it starts was not generating enough energy to keep it going. Changed the alternator, never had the same problem again. You can have your battery and alternator checked at an autozone shop for free.