I have good new charged batteries -28.2 volts
New angle arm switches from prior trouble code.
Master relay working 24v arm up o volts when arm is moved down.
Hear a double click in relay up in top area where heavy Battery wires connect to looks as if a heavy duty fuse is connected to it.
Horn work then code 115 appeared and nothing works. Code shows up if I try to move forward or back, press horn button. checked wiring to the best I can. Will reset when all power is cut but then move arm press forward and it shuts down with red maintenance light illuminating. battery reads 100%. Amplifier signal is good. I read the other posts but still have no definite fix. all help will be appreciated.