hello needing help with a drexel sl44/3 ev1B system. started jumping even in creep like the scr2 was bad. i have installed the following to get this unit to run. new scr1,2,5 new 22 and 25 recs. new card
,transformer 1x choke. so the panel has almost been rebuilt. both foward and reverse contactors are also new. i get two direction contactor trips then quits. adjusted all card trim pots. checked traction motor brushes are good and the armature is clean and smooth. i have noticed if i remove ta1 or ta2 from the traction motor the direction contactors go in and stay no pmt trip. i have check start and 1a switch in pedal ok and the thottle pot checks out correctly. i have the flight systems ev1 manual and even online disscussion with them. they are as puzzled as i am.