hi thanks for help
we had battery voltage one side of contactor and when operated only 12/18 volts on other side climbing to battery voltage over time so we replaced contactor but still have same results
battery voltage is 51 volts and all the lights work perfectly apart from the beacon that only starts after battery voltage at contactor is reached

any other ideas





Hi....... I think you have a cabel problems.....You have a broken cabel somewhere after the main contactor....or in the main shalter cabel.......after you switch on the truck you have a positive
battery(+) on the chasi of truck.......chek it....

I think the problem is in on the right hand side on the hidraulic valve blok.....remove the plastic cover of the hidraulic valve blok and see the main power cabels...that is the place where he broken.........if are not.....chek all main power cabel.
battery(+) to main shalter....to main contactor.......to fusses.....to power supply of controlers...


Good luck....)