Customer Satisfaction Notice #770
Diesel fuel heater relay wiring
No. 770 issued April 1998 - Diesel fuel heater relay wiring.
models: 1998 BR/BE (Ram) trucks
with Cummins diesel engines built through:
symptoms: The diesel fuel heater
wiring circuit MAY be missing from the PDC (power distribution center) and cause
the fuel heater to be inoperative. This could result in low engine power, hard
starting or a no start condition in colder ambient temperatures. To correct this
condition, aPDC wiring jumper and a cartridge fuse must be installed.
December 12, 1997 (MDH121216) at St. Louis North plant(J in the 11th position
of the VIN)
December 11, 1997 (MDH121113) at the Saltillo plant (G in the 11th position
of the VIN)
December 13, 1997 (MDH121310) at the Lago Alberto plant (M in the 11th
position of the VIN)
1 CED07700 Fuel heater relay wiring jumper package
1 wiring jumper, 1 40A cartridge fuse,
and 1 relay circuit holder.
A. Inspect for Fuel Heater Fuse
If the fuse is NOT present, a fuel heater wiring jumper and a cartridge
fuse must be installed. Continue with section B.
If the fuse is present, replace the PDC cover and return the vehicle to
note: If you are not sure if this
is you, open the PDC cover and look for a 40 amp cartridge fuse in cavity #7.
Cavity 7 is located in the two rows of 6 each locations running vehicle side to
side in the PDC and includes heavy fuses for heavy draw equipment.
Cavity 7 is the location on the passenger side of the row and in the row on the
right as you lean over the fender and look. If the fuse is NOT PRESENT,
you need to see your dealer.
Remove PDC cover.
Inspect the PDC for the presence of a 40A cartridge fuse in cavity 7 (fig
Section B instructions are long, and should be done by the dealer so they have
not been posted.
Thanks to Bob Bergevin for providing this bulletin
This page was edited on: May 3, 2004