I have a 1089A1P2 FMTV Wrecker that has been having issues with the dashboard connection going on and off. All the gauges reset or turn off completely for a short duration (this includes the air gauges ) and continue to operate for a random amount of time.
Parts replaced and checked so far:
Batteries checked and charged
Charging system checked
Lug behind dash cleaned and regrounded
LBCD replaced
Interconnecting box behind dash replaced