Look when i turn on watch and light turn on but main contactor turn on after when i turn up lift two time fast and the pallt truck working wlell

Hi Nac C,

The K2 contractor is the emergency contractor and should pull in when you first turn the key switch on. I don't have a schematic for this truck but you should be able to do a continuity test from fuses to key switch to determine which fuse is which, check the ignition switch for being worn and loose when being operated and if it is replace it.
Also check tightness of terminals on fuses and give wires a shake test.
Good luck with your problem.

Regards Nero

k2 contactor is that the e stop contact unit? truck had 1 of them 5 weeks ago. which fuse is for key switch i have a row of 3 and a big 40 amp fuse alone.

Hi Nac C,

If you have read the code right then 39 is referring to the main contractor being open circuit or possibly the contacts oxidised or burnt up, also a possible external load on the capacitor bank preventing the capacitor from charging. As the truck tends to run for an hour or so then it may be down to an intermittent connection from the fuse to the key switch effectively opening the K2 contactor disabling all functions and causing the electromagnetic brake to be activated.

Regards Nero