Help with convertible lift system

Just sent my switch in for a second rebuild(5 years since first rebuild).this is his response "What I want you to see it the amount of arcing occurring. This switch is really getting hot while in operation. I would inspect the wiring terminals on the switch and motor side. I believe there is something causing a restriction of the DC current.". What do I check? Is there some tests I can do to the motor? When going up or down it does kind of stop for a split second. I do have a relay kit coming.
Thanks
Aaron
Mine ended up being the motor was drawing too many amps and caused the switch to overheat. (I did have to reground everything also which helped a little bit, but the main culprit was (for me) the motor.) after a salvage yard motor out of a 97 mustang was used amp draw went down upon stating the motor to raise the top it started @ 15amps and quickly underload went to 30 amps, man that made my fuse in the harness get warm and trip. The new "ish" motor drew 6 amps and went to 14 full load @ latch position well under the 30 amps in the resettable fuse in the harness . I still have not wired in the relays since I want to finish up all my wiring before the new top and interior goes on.