Are you sure the lamp isnt working, depending how it was set it can stay OFF until the hydraulic functions or traction is in action, if the truck is just stood still the lamp doesnt flash.
Ive been called out to a RRE for this very fault, customer felt embarrassed when he released.
Factory parameter 1112 needs to be switched on for the warning light & you can only do this parameter with BT Truck Com software.
Parameter 106 sets the flashing frequency
Parameter 115 sets when the lamp will flash
Parameter 106 & 115 you can change with a BT can key.
What hydraulic functions does the truck have, I need to know so I can tell you what the parameter should be set to.
Lift, reach, tilt - has it got sideshift? 5th hydraulic function?
You got a serial number for either truck?
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