Won't crank
 

1999 gmc 6.5 turbo diesel will not crank put 2 glow plug relays .
U can push the relay for starter and it starts up. and runs fine
Can't get glow plugs to light om ground sige of relay but truck will start if u push starter relay.
Wait eng light looks to be doing fine shut off and trucks will start if u push relay for starter:scare2::scare2::scare2::scare2: