I’m restoring a 1974 V8 manual. It’s been off the road a good while and I’m working through electrical problems. The wipers and motor don’t work at all. (It’s not a linkage problem). I started by checking the security of the switch connections, fuse etc which checked out ok. When I investigated further today, I noticed the ammeter didn’t indicate a power draw when the dash switch was operated. However when I swapped the motor for a spare (condition unknown) the wipers still didn’t work but the ammeter did indicate a draw. Is there anything I should check first, have I just got two duff motors?