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Q:

no power to coil on 1999 Dodge Ram Van 3500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
how do you know when you need a ignition switch, or a crankshaft sensor or a ecm?
(1) Answer
(1) Comments
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:

http://bit.ly/mitchell_repair_manuals_online