Mercedes-Benz OM 904 LA Operating Instructions Manual page 105

Practical advice
Malfunctions, causes and solutions
Malfunction
Charge current indicator lamp does not
light up while the engine is not running
Charge current indicator lamp lights up
when the engine is running
Engine emits black smoke
6
102
Cause
Bulb defective or supply line interruption
Poly-V-belt too slack
Poly-V-belt torn
Alternator or regulator malfunction
Air cleaner dirty or blocked
Engine brake faulty
Turbocharger faulty
Misfiring, injector faulty
Solution
Replace bulb or repair interruption
Check belt tensioner for proper opera-
tion
Replace the poly-V-belt (
Check; visit a qualified specialist work-
shop
Replace the air cleaner element
Visit a qualified specialist workshop
Visual check; visit a qualified specialist
workshop
Visit a qualified specialist workshop
page 85)