Western Star Bodybuilder Book: Revision 3.2a 1A Powertrain - Power Distribution Module P. 1A-18 b Powertrain (PT-PDM) Module 286 T.o.C. The PT-PDM holds all of the power train related fuses and relays. Ÿ Engine fuses/relays Ÿ Transmission fuses/relays Ÿ After treatment fuses/relays, except DCU main battery feed (located in PNDB) The power which supplies the PT-PDM is sourced from the Power Net Distribution Box (PNDB). It is important to note that the PNDB holds the bi-stable relay, which disconnects the battery when the relay is turned off at the PNDB output. PT-PDM power is not maintained by the alternator if the disconnect switch is “thrown”.
Therefore, the engine ignition relay, in the PT-PDM, will fall out and the engine will turn off. 4700 Legacy (DD13 Shown) (CUM L9 Shown) 4700 Enhanced 4700 Legacy 4800/4900/6900 4800/4900/6900 Models: 4700L/4700 ENH/4800/4900/6900 Models: 4700L/4700 ENH/4800/4900/6900