There are at least 10 possibilities that the Crown M series do not have 3rd speed. All the 5 contactors must be activated. The first 2 contactors from the right are for directional. 3rd contactor is for 2nd speed and the last 2 contactors on the left is for 3rd speed. Try this way, open up the door, bypass the door switch, put the handle in operating position and then push in the 4th contactor by hand. Remember not to operate the speed handle (twist grip). The 5th contactor will then pull in. In other words, this will make the 4 batteries to be in series and thus have 24 volts. That is why, there is no lift function when unit is in 3rd speed. Hope this help