Posted 3/26/2021 09:33 (#8916857 - in reply to #8112062) Subject: RE: Looking at a cat challenger mt765d, what to inspect?
I have a 765D with a code 4356 "Def supply module heater relay shorted to high source " come up. Now It says "def heater open circuit" today. Were these the codes that came up when yours disconnected? Do you have a link to that service diagram or manual also?
Looking at a cat challenger mt765d, what to inspect?
