no power to coil on 1999 Dodge Ram Van 3500

how do you know when you need a ignition switch, or a crankshaft sensor or a ecm?

Asked by for the 1999 Dodge Ram Van 3500
I would start with the Engine Performance Diagnostics.
So, the best way is to check the codes in the computer to see if you have a sensor that is going out.

here is link to some good repair info:
It was the ASD sensor and the ingntion sensor