Truck is a friend of a friends. Starts fine when hot or when it's been plugged in. Drives it to work, no start cold. I'm thinking weak batteries, but have no 24v experience. Is there a minimum cranking RPM for the VP? Prolly gonna have a look at it later this week and would like to be armed with some info. I already plan on pushing him to get a FP gauge. Truck has 146k and is stock.
Thanks!
Greg

edit-morning temps around here have been mid teens to mid 20's. My 12v has been cranking slow due to lame batteries, but has started.

 

sounds like you may need some new batteries if its turning over slow. my truck starts fine in those temps and i dont even have the grid heater anymore

 

yeah, but you got a p-pump too I'm wondering if the ecm need a certain cranking rpm to fire the vp or not. I haven't even seen the truck yet, but a battery check was my first suggestion. Thanks for the reply

 

have him check the grid heaters

 

i had issues as you described. i replaced the batts with some new ones and has been great for three years now . . . this is not to say something else ain't the culprit though . . .

 

grids being checked today. Waiting on a phonecall to see what's up.

 

We can put this one to bed. I went and checked on the truck last night. It cranked too slow even when hot. Load tested the batteries individually and found one had a couple dead cells. Put a good spare in and she cranked up like a proper Cummins He's gonna try it not plugged in this morning. 11*! Talked him into getting a fp gauge before stacks too--did I do good, 24v guys? lol!