you spelled mack wrong...its mac
Mack is owned by a corporation - AB Volvo, which, in turn, is owned by its shareholders.
1985
front or rear turn signals
change the flasher relay
under the hood you should find a small 10A or 15A fuse. There is a separate fuse for the trailer turn signals.
bulbs are to small Check the fuses.
Defective Flasher Relay.
If it's an old one with a Grote turn signal switch, you'll find a little sliding gadget under the turn signal handle; pull it away from the steering column and the flashers will go on. (Move the turn signal handle to turn them off.) A new Mack will have a flasher switch with a little triangle icon.
on my truck on the top of the steering while caseing theres a little black switch if that's flipped just alittle bit it will cause the turn signals to not work try flipping the switch both ways and try the turn signals and see if that works
Turn signals do not have or use a solenoid.
A blown fuse.
Check the fuses or change the bulbs.