WARNING: This page is about a different car, the 2017 RAM ProMaster 3500, 2017 RAM ProMaster 2500, and 2017 RAM ProMaster 1500. However, it is still accessible from the selected car via links, so may be relevant.
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Disconnect and isolate the negative battery cable.
Remove nuts (1) the Power Distribution Center (PDC) cover (2).
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Disengage wire harness retainer (3) and remove the wire harness (2).
Disconnect the glow plug module wire harness connector (1).