Attention: TDR Forum Junkies 
I just started to hear a boom sound from the ABS motor in the Eng compartment . With hood open a rattle sound then boom can be heard . Looked up the ABS in the manual it states ,self test each time switch is turned on to start self test and normal sound can be heard . I have a degree of deafness in both ears and don't know what is normal sound . Have this truck now almost five years and first time for this booming . Truck is 99 3500 starts ,runs , stop ,fine just makes a boom at start up . Check lights all work and go out . Thanks for any information on this . Ron Bissett in Metro Louisville KY
