security light

I replaced the alternator on my 1999 Savana van (5.7l, 1500, 106,000 miles). I had no problems with the replacement. When I went to start the van, it started right up, but shut off when I let go of the key. Searching on the Internet, some suggested that I had a Passlock problem. I did the: turn...

I have a 2006 GMC Seirra with 87000 miles. A few days ago it started having electrical problems. I have not found any other post online with the same symptoms. While driving down the road the Security light will come on. When it comes on the gas gauge, oil pressure gauge and temperature...