I have a 2004 Pontiac Grand Prix GT2 and have recently had electrical problems when it's rained and have gone through puddles. The first time it happened, I saw the lights on the dash flash and the radio turned off and back on. When I went to turn off the car, I turned the key off and pulled it out but the car was still running. I couldn't get it to shut off so I had to pull the battery cable. I left it disconnected and it seemed to reset everything.
Another problem happened to me today, I had driven it over the weekend in the rain and when I can out to it in the parking lot today, the lights were on. I tried to start it but it said the theft system was activated. I turned the key off and on a few times and it started. I left it outside and went to start it a few hours later but it wouldn't start. After trying to start, the whole electric system was flickering on and off without the key in it and under the hood I could hear the ignition relay clicking on and off quickly. I once again had to pull the battery cable and leave it disconnected to reset it all. Also, it had drained my battery so I had to get a jump.
Does anyone have any idea what it could be? Check engine light isn't on so I don't think there are any trouble codes.
Any help would be appreciated!!!