Explain further please
I'm trying to interpret what your trying to say and I'm not getting it. You say your system is shorting out. When you say your getting 12vdc from your battery to the ground, are you saying that you are taking a multi reader and putting the positive to the positive and sticking the other lead in the the ground?
And if your disconnecting all the electrical connections, including the mpem, how are you testing the sensors and mpem for the problem?
The mpem (multi purpose electronic module) is very expensive and is protected by overload fuses. Be careful with this unit. It's the brain center for your Doo. It has am automatic shutdown on it that after several seconds (about 30) of being powered up, if you don't try to start it, it will send a signal and shut everything down.
When you have a fully charged battery in it and connect the cables, positive first then the ground, do you get a light, almost static kinda spark. When you connect the battery, do the gages come on? What kind of Doo is this 947 in? Myself and other forum members need to know what year and model this is in. Have you done the advanced DESS system check? When you put the cables on, do you get the correct, two short beeps when attaching the lanyard?