My door seal pump works fine on the ground i.e. it turns on and shuts off at the proper pressure settings.  At altitude on a long trip over 3 or 4 hours the door seal light comes on but the pump doesn’t run.  I thought I fixed the problem as I found the connectors in the overhead somewhat loose so I secured them but now I’m finding some arcing on the center (assuming power) post and if I use a small screw driver and try to complete the connection the pump barely wants to start (hard to complete circuit) it just arcs.  I’m getting good alignment between the door and airframe posts and what I assume to be good spring pressure so I’m speculating the temperature of the wires/posts (at altitude is very cold) isn’t providing good conductivity to complete the circuit.  Has anyone else seen this or can assist in troubleshooting?

John C. Bohn

Lancair 4P N28487

Direct (Cell)- 503-887-2933