Jme

What cord do I need for the block heater for a 2005 2500 quad 4X4? Also what temp would be the borderline for use? Thanx...Jamie

Jeff in TD

If it wasn't ordered with the truck, you can get the cord from a Cummins parts house (cheaper) or a Dodge dealership.

I like to plug mine in on a timer for a couple hours when the temp is down in the 30's, but that's more of a luxury than a need- just defrosts sooner/runs better sooner.

I haven't actually run into a temp cold enough to cause any difficulty starting when not plugged in- but it is noisy and lots of white smoke...

Geico266

Cummins PN 251919. About $16.

Geico266

That's when you should be plugging it in. Below 40F and it should be plugged in for an hour or two before starting. Longer when it's colder.

12PACK

I plug in for 3 hours w/ my 10 amp timer when it gets into the 30's at night. Doing this, plus my winter front, really helps warm things up in the morn, especially when I hit the highway, i.e. higher rpms and no cold air hitting the radiator.

As was mentioned, don't go to a dealer for the cord.

rammtuff

My truck is in a garage every night so it only gets plugged in a few times a year. Usually when the temp in the garage is 10 degrees or colder