OK - back to basics.....
what radio are you using?
Do you have the manual for the MFU? If not, I can scan mine and send you a copy.....then...
1) check MFU is plugged in correctly. In standard installation, the MFU-01 only activates the indicators when the steering is at full lock (MFU-03 is different, I am assuming you are certain you have MFU-01!). The previous owner may have plugged the steering servo directly into the receiver, so that the MFU can't 'see' the steering signal, and then used another channel for the 'steering input' into the MFU to activate the indicators. This allows you to activate the indicators independently of the steering using a spare channel, but means that without a separate signal to the MFU the indicators won't work (this is the set-up I use)
2) Good idea from Maverick0....do the hazard flashers work? To check that the indicator driver circuits are all OK....
3) If the MFU is installed as per manual, re-calibrate MFU. The calibration process gets the MFU to recognize the 'end points' of the stick travel so that it know when to activate the indicators (at full lock)...this may fix the turn signal problem. The MFU is pretty robust but it needs to be calibrated correctly with your RC gear. It's easy to do, manual explains how...
4) check vibration unit is OK and assembled correctly, anything loose? there is a small grub screw which holds the spinning weight onto the motor drive shaft...has this come loose? Have you tried running the vibration unit with the truck in 'engine revving' mode only, to see if its the vibration unit or something with the truck motor or transmission? Also, try driving the truck with the vibration unit unplugged from MFU....does the noise go away? The MFU has a vibration speed control, try turning this down to see if this helps?
I have a spare vibration unit if you want one
