Quote:
Originally Posted by bcredliner
When the BST connection blows it forces the cable back. If you push the cable toward the battery and pay close attention you can feel it move a bit. However, even if the cable has be fired back the engine should still start but not have enough voltage to support systems such as airbag. Make sure the new ignition switch is the correct part number for your vehicle and their isn't a problem stemming from the install. I have seen exactly your problem and it was caused by the ignition switch. And, recall that everything was fine for 3 weeks after you installed the new switch and symptoms are now the same as the old switch.
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Once the BST has blown, you will not be able to start the engine. The biggest draw on the electrical system is a starter. The starter circuit is feed from the BST cable. The airbag would have received the energize signal from the DME at the same time the BST cable would have received it signal. Some circuits such as the door lock and unlock circuit are not on the BST circuit so that they can still operate once the BST cable is blown. The fact that you can only start the engine thru a jump from the engine compartment jump terminal lead me to believe that you are back feeding the circuit from the battery jump cable.